Discover the Latest Journals in Architecture and Architectonics
Architecture is both the process and product of planning, designing, and constructing a building or structure, while architectonics is the scientific study of architecture itself. Architectural works are often considered important cultural symbols and works of art, and we often identify past civilizations with their architectural heritage.
Architecture and Architectonics
Abstract
Climate change challenges urban water management, emphasizing the need to assess future temperature and precipitation patterns. This study analyzes historical (2019–2020) and projected (2030) climate data for an urban area, focusing on monthly temperature and precipitation changes. Objectives include examining seasonal temperature patterns, precipitation variability, and associated risks. Using R programming for data analysis and visualization, large datasets were processed to identify climate trends. Projections indicate a 2 °C winter temperature decrease by 2030, slight increases in spring and summer, and significant winter, and spring precipitation increases. Findings highlight proactive adaptation strategies, demonstrating R's utility in climate impact assessment and resilience planning.
Abstract
This study examines the performance of parabolic trough collectors (PTCs) in series with a hybrid nanofluid consisting of multi-walled carbon nanotubes (MWCNT) and cobalt (III) oxide nanoparticle (Co2O3). In this study, distilled water sourced from Amman, Jordan, was used as the working fluid, while gum arabic served as the surfactant. Initially, the flow rate was 1 L min−1, and water was used as a thermal medium to join two identical PTC devices in a sequence. Subsequently, a hybrid-type nanofluid with different volume concentrations was used for experiments namely; 0.01%, 0.04%, and 0.1%. All tests were conducted between 10 a.m. and 2 p.m. on different days, equipping both collectors with a digital tracking system. After the nanofluid was prepared and tested, the heat-handling performance of the PTCs was evaluated at different concentrations of MWCNT and Co₂O₃, and the results were compared to those of pure water. In the tests, the best thermal efficiency (17.84%) was achieved when the hybrid nanofluid was used at a concentration of 0.1%. The MWCNT and Co2O3 nanofluids with concentrations of 0.04% and 0.01% obtained thermal efficiency of 17.6% and 17.02%, respectively, while water obtained 15.07%. By increasing the concentration to 0.1%, a peak optical thermal efficiency of 18.38% was achieved.
Abstract
Older multi-axis industrial robots used in industry do not have the computational power to use neural networks to perform complex manufacturing tasks. Therefore, a method combining 3D CAD modeling with data synthesis has been developed. The pix2pixHD approach allows the synthesis of photo-realistic images to generate datasets. The resulting datasets can be used to train deep learning-based detectors, which can later be applied to improve the object detection accuracy of older machine units. After evaluation of tests with YOLOv3 models, it is shown that only the datasets generated using the synthesized approach can detect an object with high detection accuracy. The generated datasets were also measured using the Complex wavelet structural similarity. The developed innovative method can be a practical and cost-effective strategy for smaller laboratories and small and medium enterprises, thus providing an opportunity to upgrade older machines.
A városkép az 1930-as években
Szeghalmy Bálint hatása Miskolc városképének alakulására
The Townscape in the 1930s
The Influence of Bálint Szeghalmy on the Development of the Townscape of Miskolc
A Képzőművészet folyóirat 1932. évi áprilisi száma a „törekvő művészek” közé sorolta a nagyváradi születésű Szeghalmy Bálintot (1889–1963) a miskolci Lévay József Közművelődési Egyesület képzőművészeti szakosztálya téli képzőművészeti tárlata kapcsán. Szeghalmy 1929-től tevékenységével – Miskolc egyik főmérnökeként és építészként is – hozzájárult a város képének átalakulásához, míg festményein megörökítette az átalakuló város eredeti épített környezetét. Akvarell és pasztell technikával alkotott, témája a miskolci évei alatt főként a városnak és természeti környezetének, a Szinva pataknak és az épületeknek az egysége. Jelen tanulmány az 1930-as évek városfejlődését is tárgyalja, Szeghalmy közvetett és közvetlen szerepét a városkép átalakulásában, azokat a hatásokat, amelyeket hozhatott és alkalmazhatott főbb miskolci épületeinél. Munkássága nem volt konfliktusoktól mentes a városban, így azokat a hivatali munkásságához kapcsolódó, de személyét magánemberként is érintő nézeteltéréseket is feltárja a tanulmány, amelyek kísérték és meghatározták hivatali éveit.
Habár Szeghalmy Bálint korának egyik legfoglalkoztatottabb templomépítője volt, életéről és munkásságáról kevés tanulmány áll rendelkezésünkre, monografikus feldolgozása sem foglalkozik részletesen az egyes épületekkel és állomásokkal. Jelen tanulmány kizárólag a miskolci és Miskolc környéki munkásságával foglalkozik, teszi ezt elsődleges források – korabeli levéltári dokumentumok, újságcikkek, korabeli fényképfelvételek, festmények és építészeti tervek – segítségével.
Abstract
A key aspect of sustainable development is the preservation of the natural environment. Due to the gradual depletion of natural resources, modern society is confronted with challenges in concrete that utilize a large number of natural resources. This paper strives to decrease reliance on natural resources, efficiently utilizing waste materials. The study examined the behavior of concrete by incorporating over-burnt brick aggregate as a partial replacement for natural aggregates ranging from 0 to 100%. A series of tests were conducted to assess the characteristics of aggregates and concrete. Through experiments it has been observed as replacement content increased, mechanical and durability tests consistently showed a decline in performance. Results showed replacement of up to 25% of C20/25 concrete grades without sacrificing structural integrity helps with sustainable development and makes better use of waste.
Abstract
The experience proves that solar power installations worldwide are growing rapidly. Renewable energy sources other one as solar energy has the potential to reduce the ecological footprint. The converter that utilizes renewable energy technologies and methods are constantly evolving with their spread, purchasing goods are becoming more and more favorable. In this study the measurement of the time period March 1–31 is presented at a waterworks. During the measurement, hourly recordings were taken. During the study, load power, generated power, grid power, specific electricity consumption, electricity consumed distribution, and the energy cost were determined.
Abstract
The spread of new energy vehicles has opened a new chapter in premium-class acoustics. In e-mode, hitherto inaudible noises – suppressed by traditional engines – have become audible. Therefore, it is necessary to make subjective noises objective. The first step is to make them comparable by measuring. The result of the sum of these spectrograms is an acoustic fingerprint of the vehicle.
The next step is to add them to a database. Early failure prediction and the avoidance of redundant service activities by using automated event detection led to financial savings. Data processing with machine learning opens space for car workshop support applications, and it is also possible to prevent critical failures that may begin with the help of predictive models (predictive service).
Abstract
A tramway is a type of public transportation system that uses streetcars running on rail tracks. It provides a reliable and comfort means of travel for short to medium distances. When choosing the best site location for a tramway, several factors should be considered to ensure effectiveness and efficiency. The aim of this paper is to identify the main criteria for selecting the best location of tramway routes, and statement the influence of each criterion through the utilization of the analytic hierarchy process. The outcome showed that the primary criteria were (traffic flow, land use, travel time, traffic emission, traffic noise), and their influences based on analytic hierarchy process method were 37.83% for traffic flow, 29.43% for land use, 19.11% for travel time, 7.97% for traffic emission, 5.65% for traffic noise.
Abstract
In modern industrial applications, automation is achieved using distributed control systems or programmable logic controllers, widely adopted across sectors. Proportional integral derivative control in closed-loop systems is a key strategy. As these controllers have been used for decades, replacements are necessary over time. This research focuses on replacing controllers, firmware, or Input/Output cards, examining the feasibility of adapting proportional integral derivative control parameters to new systems. The study analyses how these changes impact operation, energy consumption, and quality, based on experiments with Wago programmable logic controllers and analytical methods.
Abstract
The current study aimed to examine the value of applying the hybridization approach to study the flexural behavior of hybrid reinforced concrete beams including two different concrete types: normal strength concrete and reactive powder concrete. In addition, carbon fiber-reinforced polymer bars and glass fiber-reinforced polymer bars were bonded in the tension face of the hybrid RC beams utilizing the near-surface-mounted technique. Eight simply supported reinforced concrete beams were tested. The hybridization technique enhanced the flexural behavior and increased the first crack and ultimate loads. Furthermore, the hybrid beams are stiffer than that of a normal beam, and it became even stiffer as the reactive powder concrete layer thickness increased. The hybrid beams that were strengthened with carbon fiber-reinforced polymer bars displayed higher load capacity by about 20% more than those strengthened with glass fiber-reinforced polymer bars.
Abstract
Cement production generates nearly one ton of carbon dioxide for every ton manufactured, contributing significantly to environmental degradation. Geopolymer concrete, which incorporates industrial by-products, for example, fly ash, metakaolin, and ground granulated blast furnace slag, offers a sustainable alternative. This study explores the use of stone quarry dust as a replacement for natural sand in brick production. A blend comprising 70% metakaolin, 30% ground granulated blast furnace slag, and stone quarry dust, activated with sodium silicate and sodium hydroxide, yielded bricks with high compressive strength, minimal water absorption, and excellent acid resistance. These eco-friendly bricks provide a cost effective, durable alternative to conventional bricks, making them suitable for diverse environmental conditions.
Abstract
The paper focuses on the creation of 3D models of indoor building environments. The data for model creation is acquired using a developed mobile mapping system, which consists of a combination of various sensors. It includes a trio of 2D and 3D light detection and ranging unit, an inertial measurement unit, a stereo camera, and rotary encoders. The collected data is processed using simultaneous localization and mapping through a graph-based approach. The quality of the created 3D model is numerically quantified.
The first part of the paper describes the developed mobile mapping system, which comprises three subsystems. The next section explains the processing of the collected data using simultaneous localization and mapping. The quality of the created 3D model is subsequently analyzed. The final section evaluates the results and outlines future objectives of the research.
Abstract
This study experimentally investigates a natural gas-diesel dual-fuel naturally aspirated engine's combustion and emissions under low to high load and constant engine speed. The natural gas is supplied with constant pressure at the intake manifold through an air-gas mixer. A mechanical high-pressure fuel injection pump automatically controlled the diesel fuel. Results indicate that using natural gas reduced diesel fuel consumption, CO2, smoke, and NOx emissions, but increased CO emission with different values according to engine load. As well, in-cylinder pressure and heat release rate are influenced by using natural gas and changing engine load. These results differ from prior research; therefore, this study could be a basis for future research on hydrogen-natural gas blends.
Abstract
The current investigation shed light on examining the properties of ceramic based composites manufactured with various percentages of alumina and zirconia. Compressive strength, volumetric shrinkage, apparent porosity, and apparent density of the ceramic composites were the most significant outputs that impacts the composites quality. Therefore, this paper aims to evaluate the resulted composites according to these outputs' response. It was noted that the dominant peaks in the X-ray diffraction results is tetragonal zirconia in spite of using monoclinic zirconia during the composites manufacturing. The optimum compressive strength of 370 MPa was emerged with specimens after sintering produced with 70 wt.% zirconia and 30 wt.% alumina. Moreover, the zirconia-alumina composites findings revealed a remarkable improvement when compared with ceramics made from these materials individually.
Abstract
This work aims to numerically study a latent heat storage system consisting of a tank filled with a phase change material, through which a heat transfer fluid flows. A comprehensive parametric study was conducted to analyze the thermal and dynamic performance of the system, examining the effects of various parameters, including tank height, heat transfer fluid mass flow rate, phase change material layer thickness, and the amount of energy stored during the charging process.
The system was modeled using computational fluid dynamics to simulate the phase change phenomena. It was seen that a higher mass flow rate led to a shorter storage time and reduced stored energy, with values of 19.25 kWh for a flow rate of 0.6 kg s−1 and 20.16 kWh for a flow rate of 0.4 kg s−1.
Abstract
Delivering Advanced Driver Assistance System functionalities depends on acquiring high-resolution image data from vehicles. Adverse weather and nighttime degrade image quality, impacting object detection accuracy. This paper addresses this issue by proposing a novel solution using the vehicle's Global Positioning System location and timestamp to query weather via a weather application programming interface. By obtaining weather details at the time and location of data collection, image quality is enhanced through pre-processing tailored to specific weather conditions. Using the Detection in Adverse Weather Nature dataset, the method improves You Only Look Once version 8 software detection accuracy by up to 15% compared to baseline performance across various weather conditions, enhancing Advanced Driver Assistance System reliability.
Abstract
As a result of global warming, Hungary's climate characteristics are shifting towards hot, dry conditions, for which the local building stock is not prepared. The research focuses on the effectiveness of the application of the “secondary building skin”, a passive architectural solution that supports to create the required thermal comfort in buildings. The applicability of the solution is supported by measurements and simulations, combining the energy renovation possibilities of Hungarian “cube-type houses” and adaptive technology that migrates with climate. The article examines the reduction of heat load on buildings and its impact on the indoor operative temperature. Also, it shows how the visual appearance of the secondary building skin can become an architectural character element as a tool for sustainability.
Abstract
Due to the transfer of environmental heat into buildings, requires consuming large amounts of electrical energy for absorbed heat gain. This study used sunflower seed husks as one of the industrial residues, as a waste material. These husks were ground into a nano-powder and blended with cement at a weight of 1:5. From this mixture made of 12 mm diameter balls then added back to the building block mix during formation. The thermal behavior of the walls constructed from these blocks was tested in the climate of Baghdad, during daylight hours on the 21st day of each summer month (May – July) in 2022. The optimal addition ratio was 4%, which achieved a heat load of 176.2 kW and an electricity consumption of 110.2 kWh, resulting energy savings of 18.1% compared with a traditional wall.
A kupolák tisztelete
Az egykupolás dzsámik eredete és térhódítása az oszmán építészetben II.
Respect for Domes
The Origin and Spread of the Single-Domed Mosques in the Ottoman Architecture II.
Az oszmán építészet a turisták számára egyet jelent a Kék mecsettel, a szakemberek többsége számára pedig a bizánci építészet, különösen pedig a Hagia Sophia másolásával. Igaz, Bizánc és Konstantinápoly, amely akkor szinte egyet jelentett a művelt világgal, vonzotta és inspirálta is a szomszédságában államot alapító oszmánokat. De volt ezzel így más is, akár tanulmányunk tekintetében szűkebb értelemben a kupolák esetében is. A Földközi-tenger keleti medencéje és a mai Közel-Kelet évezredes hagyományokkal bír a boltozatok és kupolák alkalmazása terén. Különösen igaz ez Iránra, ahol az egyéb építőanyagok híján rákényszerültek ezeknek a szerkezeteknek az alkalmazására és továbbfejlesztésére is. Ez a szeldzsuk birodalomban olvadt össze a nomád törökség kupolatisztelő hagyományaival, és ez az ötvözet termékenyítette meg az oszmán építészetet, amelyet természetesen színesített a bizánci, sőt az itáliai reneszánsz építészet is. Az oszmán szakrális építészet legjellegzetesebb produktuma az egykupolás dzsámi, mely szeldzsuk alapokból fejlődött ki, de már a 14. század első harmadától oszmán alkotásnak tekinthető. Akár önálló épületként, akár összetettebb tér uralkodó elemeként alkalmazzák, az egykupolás dzsámi lesz az oszmán legmeghatározóbb építészeti eleme. Ennek kialakulásával és fejlődésével foglalkozik a jelen tanulmány, mely két részletben olvasható. Az első részt előző számunkban közöltük.
Abstract
Inclined duct has many engineering applications like air conditioning system, solar collector and cooling system of photovoltaic module. Forced convection of air flowing through an inclined square porous duct is described in this paper. The experiments by varying Reynolds number, heat flux and inclination angle have been conducted under Reynolds number at 8355, 13485 and 18600 range, heat flux 480, 990 and 1520 W m−2 and inclination duct angle 30°–60°. The porous pad used was zig-zag metallic wire mesh with porosity equals 0.99. The results show that Nusselt number is increased with increasing heat flux and Reynolds number at all orientations. At the same Reynolds number and heat flux, Nusselt number is enhanced about 4.7% with increasing inclination angle from 30° to 60°. Nusselt number is to be 24%, 21% higher than horizontals porous duct at inclination angle 60°–30°, respectively. Many empirical relations have been obtained.
Abstract
The study aims to develop a predictive model for crack propagation in a blade's plate. The finite element method is employed to simulate the blade's entire structure. ANSYS software is utilized to model the plate and determine its natural frequencies under cyclic loading. The results obtained through the finite element method are compared with data from the literature to confirm the validity of the proposed model. Both natural and forced vibrations of the blade's plate, including double-edge cracks, are analyzed. Various crack sizes and locations are modeled to investigate their impact on the blade's behavior. The proposed model effectively identifies the crack in the plate that forms earlier and achieves a high accuracy in predicting the crack's size and location under cyclic loading.
Abstract
Stress analysis is a branch of mechanical engineering that investigates the stress and strains generated in materials when subjected to forces. Photoelasticity is one of the well-known methods in plane stress analysis. This analysis was conducted to show the superiority of the photoelasticity method in investigating the stresses of the spur gear teeth. Four cases of various spur gear teeth profiles have been presented. The principal stress difference was calculated experimentally for each case and it was validated numerically and the error percentage reached 4.15%. An enhancement percentage was achieved at 33% in case 3 leading to the fact that using the asymmetric spur gear teeth reduces the generated stresses.
Abstract
The in-plane tensile-compressive test is a key method for studying plastic behavior under complex loading. This study presents a novel anti-buckling fixture designed for cyclic testing. The device can conduct monotonic tensile-compressive tests with deformations of up to 10%. The specimen is encased in an acrylic block for structural stability and to prevent buckling. Its application and impact on the force-displacement curve have been addressed. The AutoGrid optical strain measurement system was integrated with the fixture for strain analysis, and its accuracy was systematically evaluated. The developed fixture is well-suited for accurately describing the plastic behavior of materials under complex loading paths and it aids in precisely determining the kinematic hardening characteristics.
Abstract
In a manuscript the results of research of the characteristics of a flat air stream with a variable mode of its flow into the room depending on time and current position are presented. Analytical equations for calculating the flat air jet parameters were derived. Numerical modeling of the incoming air stream in the variable mode was carried out due to CFD FLUENT (ANSYS FLUENT) software using the k–ε turbulence model. Method of a four-parameter numerical simulation of the flat incoming airflow in the variable mode is devised.
Abstract
Amputees pursue to obtain an artificial limb that suits them and adapts as close as possible to their healthy limb, especially for amputees of the lower limbs that are characterized by the necessity of performing the function of walking through the existing joints to make the amputee feel like having a healthy limb and perform its own needs. Here in this research we will address the improvement of the prosthetic limb of the amputee through the ankle joint, as a movable ankle joint was designed for the level of amputation through the ankle joint in the SolidWorks program and the data was analyzed using ANSYS to find out the extent to which the joint is able to perform plantar flexion and dorsal flexion movements and its range of motion by applying them realistically through tests conducted on the amputee when wearing the prosthetic with the hinged ankle joint and simile it with the conventional prosthetic with the fixed joint.
Abstract
Nowadays, aligned with the national mission, the growth of Unmanned Aerial Vehicle (UAV) application is enormous. This research work investigates the probability of adding epoxy resin with novel biofibres such as Tamarindus indica and Morinda citrifolia to fabricate a composite material. A sustainable outcome is delivered by adopting Tamarindus indica and Morinda citrifolia fibres in UAV frame materials, which combine increased mechanical strength and durability with good environmental conditions. Based on the mechanical test outcomes, the Tamarindus indica composite (ETI) indicates significant compressive strength with an optimum load-carrying capacity of 5.98 kN and notable tensile strength is a maximum of 8.13 MPa, therefore Tamarindus indica composite plate can be used in rigid or definite-shaped applications due to its high resistance to deformation. The Morinda citrifolia composite (ETC) indicated high flexibility rate due to carrying a flexural load (0.15 KN), so it can be used as a dampening or cushioning material to absorb the vibrational energy. These two novel biodegradable composite materials possess a lower density and a higher strength-to-weight ratio, which are important properties for decreasing power consumption and improving the UAV's endurance. We investigated the chemical and morphological characteristics of the novel composites using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). These novel biomaterials significantly reduce vibrations from UAV propellers and metal corrosion. Based on the research outcomes, using novel bio composites increases the mechanical strength and lifespan of UAVs and it also reduces their weight and power consumption.
Abstract
This research presents an experimental program to study the effect of adding brick waste as a replacement for gravel in concrete mixes. Styrene butadiene rubber and super-plasticizer Flocrete PC200 were used at 10% and 1.4% of the cement weight, respectively. The study evaluates key mechanical properties, including flexural, compressive, and tensile strengths, at 28 and 90 days. Seven replacement ratios of brick waste were tested: 0, 10, 20, 30, 40, 50, and 60%. The experimental results showed that the compressive strength achieved its optimum strength at a 30% replacement ratio, while the flexural strength reached it maximum value at a 40% replacement ratio. Additionally, it was observed that brick waste reduces the density of polymer concrete, which could potentially lower the dead load of structures and result in cost-effective construction.
Abstract
The aim of the presented is to investigate the effects of different helical fin pitches (20, 40, and 60 mm) on the performance of helical fins on inner tube outer surface. With an outer tube diameter of 65–75 mm, an inner tube diameter of 25–35 mm, and a length of 400 mm, water was used as the heat exchange fluid. The cold fluid entered the inner tube at a 20 °C temperature, with a Reynolds number ranging from 3,000 to 10,000. The hot fluid flowed through the annular space between the two tubes at a constant rate. The study utilized numerical simulation in ANSYS FLUENT v.21 software. The inner pipe was constructed of aluminum, while the outer pipe was insulated. The numerical results indicated that heat transfer and thermal performance initially increased and then decreased as the pitch of the helical fins increased.
Abstract
The present study uses three mathematical approaches to analyze the dual-purpose solar collector, making it a novel contribution. Three MATLAB codes (C1, C2, and C3), each with its mathematical model, are developed. The effectiveness- number of transfer unit method is used in C1. The heat removal term is used in C2. In C3, the effectiveness term of the parallel flow heat exchanger is used. Mathematical modeling, simulation, and experimental validation are conducted for each code. The calculated numerical-experimental errors revealed excellent convergence. The root mean square error and the mean absolute error for C3 are 1.8 and 1.5, respectively, which are less than for C2 and C3. This indicates that C3 is a reliable approach and can assist researchers in future analysis of the dual-purpose solar collector.
Abstract
Due to the rising demand for battery-operated electrical vehicles (EVs) and equipment, it has become essential to establish a system that is continuously monitoring and managing the performance of each battery. This article presents the design of Battery Management System (BMS) based on intelligent fuzzy logic controller (FLC). The development of battery models and design of FLC is performed within the environment of MATLAB programming software. The FL controller uses the monitored signals of the battery, represented by state of charge (SOC), state of health (SOH) and temperature (Temp) as the input variables, which are processed within fuzzification and defuzzification stages inside the FL platform to yield crisp outputs. The effectiveness of proposed controller has been assessed under two types of member functions (MFs): triangular MF and Gaussian MF. As compared to other existing control techniques in the literature, the proposed FLC outperforms these control schemes in terms of charging time. Moreover, the numerical results showed that FLC based on Gaussian MF gives better performance as compared to that based on triangular MF in terms of accuracy and charging time.
Abstract
This paper explores the impact of participatory design in educational spaces through a case study of the Law Faculty Library at the University of Prishtina. Within the course of Interior Design at the Faculty of Architecture a participatory project was initiated, engaging students, faculty, and staff in a collaborative process to address poor functionality and out-dated infrastructure and to develop a contemporary design that introduces flexible zones, modular furniture, and modern lighting, creating a dynamic, user-centered setting. The study emphasizes the value of participatory design in interior design education in improving the student learning experience and producing adaptable, functional interiors aligned with user needs.
Abstract
This research dealing with mathematical modeling of sewer network in urbanized area, which means creating a mathematical model in mathematical software MIKE URBAN. This software is designed to compute and create the model of surface runoff in chosen area. This model is creating because sewer system in Slovakia and also in the world is out-dated. Out-dated means, in the past sewer systems were designed for the fastest transport waste water and rain water from urbanized area. The rapid development of cities in the form of increasing urbanization has changed the original hydrological processes in cities. An increase in surface runoff with an out-dated sewage system can result in local floods in a short period of time. Therefore, it is necessary to create mathematical models to assess sewers in terms of their hydraulic capacity.
Abstract
Fuel cells are a pivotal technology in the changes towards sustainable and clean energy methods due to their high energy performance and environmentally aligning functioning. This investigation carried out an overall computational analysis to investigate the influences of these crucial factors on the efficiency of a single fuel cell. This research work measures the influence of parameters on key performance variables like polarization curves, electric potential and current density output. The results show that higher inlet pressures and mass flow rates significantly enhance reactant transport, thereby decreasing concentration losses and improving polarized current outcomes. GDL porosity and electrode exchange coefficients are found to play a significant role in enhancing reactant distribution and electrochemical reaction kinetics leading to good utilization of fuel and higher cell performance. Conversely, higher inlet temperatures negatively impact efficiency due to rises in thermal stresses and reduced reactant concentrations at critical reaction zone. Furthermore, the research identifies optimal ranges for these parameters, offering actionable insights for improving fuel cell design and operation. These results contribute to the broader efforts in advancing fuel cell technologies paving the way for their effective deployment in clean energy applications. This study underscores the importance of integrating computational analysis into the optimization of high-performance and durable fuel cells for the energy demands of the future.
Abstract
This paper presents experimental results using the ultrasonic flow-meter “Dnipro-7U” on limited straight sections of water pipelines located before turns and branches. In these pipeline sections, asymmetric water velocity profiles can lead to reduced accuracy in flow measurements using an ultrasonic flow-meter.
It was observed that the accuracy of the ultrasonic flow-meter on short straight sections depends on both their length and the water flow regime. The device's passport error is specified as 2%. An additional error (ranging from 0 to 3%) may arise due to variations in the reliability of water flow and supply characteristics input by the operator, deviating from the average values used in the operational calculation algorithm during measurements.
Abstract
Plastics are low cost, lightweight, and many uses material. As result, increase in plastic led to the environmental pollution. So, this incited the researchers to use the plastic in concrete to produce sustainable concrete. In this paper, experimental work was presented to investigate the behavior of columns with and without waste fibers polyethylene terephthalate under axial load. These columns were divided into three groups depended on ratio of fiber 0%, 0.5%, and 1% and configuration of steel bars. Some mechanical properties of concrete were tested. Main results obtained fiber inclusion resulted in an improvement in splitting and a decrease in compressive strength. Results also showed an improvement in crack load for columns when adding fiber, which reached the highest percentage about 45.79%.
Direction Dependent Mechanical Behavior of ETFE Foils
Az ETFE fóliák irányfüggő mechanikai viselkedése
In recent decades, the use of ethylene-tetrafluoroethylene (ETFE) membranes has been increasing in the building industry for lightweight transparent structures. The nonlinear behavior of this material has garnered significant attention from researchers in recent years. However, there remains uncertainty regarding whether the material is orthotropic or isotropic, leading to conflicting conclusions in the literature. This work aims to clarify this question.
To achieve this, uniaxial tensile tests were conducted on NOWOFLON ET 6235 foil at temperatures ranging from 16 °C to 32 °C, covering material orientations from –90° to 90° relative to the machine direction in increments of 15°. The results indicate that there is no significant difference in behavior based on cut orientation at small strains. However, a slight orthotropic behavior becomes evident after the initial inflection point on the engineering stress-strain curve, as confirmed by ANOVA analysis.
A kupolák tisztelete
Az egykupolás dzsámik eredete és térhódítása az oszmán építészetben I.
Respect for Domes
The Origin and Spread of the Single-Domed Mosques in the Ottoman Architecture I.
Az oszmán építészet a turisták számára egyet jelent a Kék mecsettel, a szakemberek többsége számára pedig a bizánci építészet, különösen pedig a Hagia Sophia másolásával. Igaz, Bizánc és Konstantinápoly, amely akkor szinte egyet jelentett a művelt világgal, vonzotta és inspirálta is a szomszédságában államot alapító oszmánokat. De volt ezzel így más is, akár tanulmányunk tekintetében szűkebb értelemben a kupolák esetében is. A Földközi-tenger keleti medencéje és a mai Közel-Kelet évezredes hagyományokkal bír a boltozatok és kupolák alkalmazása terén. Különösen igaz ez Iránra, ahol az egyéb építőanyagok híján rákényszerültek ezekneknek a szerkezeteknek az alkalmazására és továbbfejlesztésére is. Ez a Szeldzsuk Birodalomban olvadt össze a nomád törökség kupolatisztelő hagyományaival, és ez az ötvözet termékenyítette meg az oszmán építészetet, amelyet természetesen színesített a bizánci, sőt az itáliai reneszánsz építészet is. Az oszmán szakrális építészet legjellegzetesebb produktuma az egykupolás dzsámi, mely szeldzsuk alapokból fejlődött ki, de már a 14. század első harmadától oszmán alkotásnak tekinthető. Akár önálló épületként, akár összetettebb tér uralkodó elemeként alkalmazzák, az egykupolás dzsámi lesz az oszmán legmeghatározóbb építészeti eleme. Ennek kialakulásával és fejlődésével foglalkozik a jelen tanulmány, mely két részletben olvasható. A második részt a következő számunkban közöljük.
Abstract
The wall paintings in Ottoman religious buildings in Albania exhibit a complex blend of cultural, religious, and aesthetic features. This study examines four significant religious buildings in Albania - two mosques and two Tekkes - and analyses the decorations found in these murals, focusing on their typological classification, symbolic meanings, aesthetic character, and contextual relevance. Employing a qualitative research methodology that includes literature review, site observation, architectural documentation, and comparative studies, this research aims to provide a comprehensive understanding of these wall paintings. The findings highlight the aesthetic, religious, and cultural significance of the murals within the broader narrative of Islamic art and architecture. This research enhances the understanding of Albania's particular involvement in the Ottoman artistic inheritance and emphasizes the necessity of preserving these important artworks.
Abstract
Two-layer composite beams using plain concrete reduce structural component costs and improve flexural performance. The research will analyze the flexural behavior of concrete beams reinforced with two kinds of bars. Four specimens used a single layer of conventional and high-strength concrete, whereas the other four employed a two-layer beam integrating both types of concrete. This research included two types of reinforcement: steel and glass. The upper layer used 62 MPa high-strength concrete, while the lower layer comprised 38 MPa regular concrete. Bilayer beams provide a greater ultimate load capacity than one-layer concrete beams. The flexural capacity of high-strength and bilayer steel-bar beams exceeded that of conventional concrete beams by 9.46 and 19.76%, respectively. Bilayer beams support 18.85% more loads than conventional concrete beams.
Abstract
Fire simulations are becoming more and more widely used in fire protection practices. In order to achieve more accurate results, it is inevitable that simulations are always developed. This study investigates the fire behavior of various complex wooden geometries. This research aims to enhance the understanding of fire propagation of different geometries made of wood. The simulations are performed using fire dynamics simulator, which incorporates heat transfer, combustion, and fluid dynamics principles. Key parameters like temperature and heat release rate are analyzed for each of tree geometries. The research contributes to the development of more accurate fire models. It also provides the basis for further development of simulations including more complex geometries.
Abstract
Water is the main source and element of life on Earth for the survival of living organisms; agricultural, economic and social activities. With the development of modern technologies, including geographic information system and remotely sensed data to study natural resources, including water detection. These techniques use to prepare a digital map depending on determine the optimal location. With help of global positioning system receiver, the coordinates of the well sites are determined and fixed on the ground, and then it documented using geographical information system. The result is to specify eight artesian wells distributed on area of interest with area covered 125,000 m2 for each well. This contributed to increasing green areas from 2% to 33% of the total study area and creating a green belt.
Abstract
Rail stations are locations where passengers are picked up and dropped off by trains. This article aimed to determine the optimal locations of tramway stations in Karbala City, Iraq, by using the geographic information systems program. Two model builders had been used, one for origin-destination stations and one for intermediate stop stations. The selection of best locations depended on many criteria, which are the walking distance to active zones were had high trip attraction, land use, and population. For criteria weighting process an analytic hierarchy process method had been used. Five suitable end stations were selected which were located at the entrances of the city, and four groups of intermediate stations had been chosen. Group A consists of 32 stations, group B consists of 26 stations and for group C and D 22 and 22 stations had been chosen. The stations distance was between 300 and 1,000 m.
The Potential Applications of Shape Memory Alloys in Monument Preservation
Az alakemlékező ötvözetek alkalmazási lehetőségei a műemlékvédelmi rekonstrukciókban
Materials with shape memory properties can return to a predetermined shape upon exposure to heat after deformation. This phenomenon was first discovered by Swedish physicist Arne Olander in 1932, when he observed the unusual properties of gold-cadmium alloys. Subsequently, researchers such as Chang and Read also studied this material behaviour as early as 1951. By 1958, these properties were presented at the Brussels World Expo, and in 1961, similar characteristics were identified in nickel-titanium alloys at the U.S. Naval Ordnance Laboratory while investigating other properties of the material.
Despite the fact that the knowledge of these materials and their properties dates back more than 90 years, our understanding of them remains relatively limited, and they continue to be the subject of ongoing research. Shape memory alloys have a wide range of applications, including significant uses in the field of medicine. This study focuses primarily on their structural applications, particularly in the context of historical buildings, including their integration as a protective measure against earthquake damage.
The broader understanding and application of shape memory alloys (SMA) offer significant potential for the restoration of historic or heritage buildings, as well as for preventing further damage to their structural systems. This can be achieved without the need for extensive modifications to the original structure, geometry, or appearance. This is due to the mechanical properties of SMA-containing structures, which allow for minimizing the cross-sectional size, the number of anchorage points, and the extent of invasive interventions. Unlike traditional methods, this enables the use of a less intrusive reinforcement approach to protect buildings effectively.
The aim of this research is to present the properties and behaviour of these materials, existing examples where shape memory alloys have been successfully applied, and explore their potential applications.
Abstract
This study assesses the performance of four nature-inspired optimization algorithms—Dynamic Differential Annealed Optimization (DDAO), Flower Pollination Algorithm (FPA), Firefly Algorithm (FF), and Particle Swarm Optimization (PSO) for achieving optimal space truss design. The aim is to minimize the structural weight of three benchmark trusses (10-bar, 25-bar, and 72-bar) while meeting stress and displacement constraints. The key contribution of this work is the first systematic evaluation of FPA in space truss optimization, demonstrating its greater effectiveness in obtaining optimal or near-optimal solutions with faster convergence and higher stability compared to PSO and FF. The results also highlight the limitations of DDAO in handling constrained engineering problems. Findings confirm that FPA and FF are highly effective for structural optimization, offering robust solutions with minimal computational cost. These insights contribute to advancing metaheuristic-based structural design, supporting the adoption of FPA in large-scale optimization problems.
Analysing Construction and Building Techniques of Neogothic Stellar Vaults
The Case of the Cathedral of Košice
Neogótikus csillagboltozatok szerkesztés- és építéstechnikájának elemzése geometriai vizsgálattal
A kassai dóm példája
In this article, we present a point cloud-based geometric analysis method applied to the 19th-century stellar vaults of the Saint Elisabeth Cathedral of Košice (SK). We based our analysis method on the geometric typology systems we worked out for net vaults during our earlier research. After elaborating on the method’s application to stellar vaults, we present the results of the analysis. This includes the exact geometric description of the vaults’ webbing and rib system, which allowed for deductions about their original construction techniques. Then, we present the re-modelling of the rib systems of the cathedral’s stellar vaults based on the most influential theoretical works of the 19th century (B. Ranisch, F. Hoffstadt, G. G. Ungewitter), such as the principle of the longest route or projecting the junction points to a spherical surface. Afterwards, the comparative analysis of the real vault geometries and the re-modelled rib systems was carried out. Based on this, we discussed the potential reason behind the differences detected. This gives a valuable insight into whether the 19th-century theoretical works and their contemporary building practices differed. Additionally, we elaborated on the implications of the multiple possible three-dimensional geometries of the same rib pattern regarding the authenticity of theoretically reconstructed stellar vault structures.
Abstract
The European Union's (EU) future will be fundamentally determined by innovation-based competitiveness. The study examines what characterized the EU's innovation status as a whole and its member states between 2017 and 2024. For the situation analysis, the study examines the development of the Summary Innovation Index (SII) values describing the innovation status of the member states using the ARIMA model and K-means clustering. The study estimates the expected innovation status of the EU and its member states in the medium term using the Linear Trend Model. The results show that innovation is the least coordinated area of the EU cohesion policy, as there is a significant gap in the innovation status of the member states. In the case of the two extreme innovation values, the difference is four times greater. By this ratio, the average innovation development of the Scandinavian states is higher than the development level of some Eastern European member states. The extrapolation results show that the innovation gap will likely persist in the medium term despite continuous modernization.
Abstract
Car body panels are one of the vehicle components that support the existence of the car interior and maintain the safety of passengers, especially in monocoque-type car bodies. Car panel materials, which generally use steel materials, have the disadvantage of being relatively heavy and having a short service life due to corrosion. To achieve higher energy efficiency in energy-efficient vehicles, honeycomb sandwich structures made of polymer composites, which are lighter in weight, can achieve a higher power-to-weight ratio. In this research, a polymer matrix composite material with a honeycomb sandwich structure was created and tested as an alternative material to replace steel for car body panels. Composite made from WR-200 Fiberglass as a reinforcing agent and SHCP 2668 CM-M resin as a bonding agent to determine the effect of the detailed honeycomb sizing, especially on the flexural strength and stiffness characteristics, have been used. Several specimens were made with variations in cell-pitch sizes of 20 and 40 mm, variations in the cell-height size of 10, 20 and 40 mm and variations in the thickness of the cell wall thickness obtained from the use of layers of Fiberglass of one, two and four layers. From the bending tests performed on all specimens, it was known that the highest flexural strength value have the specimens with a cell-pitch size of 20 mm, cell height of 10 mm and cell wall thickness of 4 layers of Fiberglass, namely 36.13 N mm−2. The specimen has the highest stiffness value with a cell pitch of 40 mm, cell height of 40 mm and cell wall thickness of 4 layers of Fiberglass, which is 338 N mm−1.
Abstract
Applying Machine Learning (ML) has seen rapid progress in many disciplines, such as architectural design. Recent research reveals promising potential for integrating ML in solving design problems. This paper explored how ML can serve as a tool to guide designing action. It conducted thematic analyses of ML experiments in the architecture domain to build a framework addressing two key aspects: the tasks achieved and the required training dataset. The paper found that ML mainly performs design generation, optimization, and recognition via classification and clustering. Three scenarios of design generation using ML have started from pre-design requirements and constraints, conceptual design, or parametric design. ML can predict design features based on prescribed performance or calculate performance metrics, based on varied design options. Design recognition classifies or clusters designs to detect their styles, typologies, and morphologies, besides tracking the process of best practices. The specifications of training datasets vary in terms of data sources as real or virtual, techniques for representing datasets as visual or textual, and the relationships between input and output datasets as refinement, embodiment, sorting, or evaluation. The findings revealed that ML has a wide range of experimentation and opens more opportunities for further integration in the design process.
Abstract
Systems based on mobile multirobots have gained considerable attention in the past two decades because of their efficacy and flexibility in various real-world applications. An essential component of these systems is multi-robot task allocation (MRTA), which concerns allocating tasks to mobile robots in an efficient manner. The effectiveness of MRTA is influenced by the size of the search space and computational time, and both increase substantially as the number of tasks and robots involved increases. This study introduces an effective solution to the MRTA problem by employing a two-stage approach. First, nearby tasks are automatically grouped into clusters by using an enhanced dynamic distributed particle swarm optimization algorithm. Second, mobile robots are assigned to the closest clusters. To demonstrate the effectiveness of this approach. Simulations are conducted to compare the proposed method with particle swarm optimization and differential evolution approaches. Numerical results confirm that the proposed approach exhibits highly competitive performance in terms of clustering cost, clustering time, and overall time (clustering and assigning time). This approach is advantageous for real-world applications involving numerous robots and targets.
The Operation of the Local Sections of the Hungarian Association of Engineers and Architects Between the Two World Wars Through the Example of the Pécs Section
A Magyar Mérnök- és Építész-Egylet vidéki osztályainak működése a két világháború között a pécsi osztály példáján keresztül
The aim of the Hungarian Association of Engineers and Architects as a professional and interest association, which had been in operation since 1867, was to promote mutual acquaintance, exchange of ideas, discussion of conventions and professional issues, the creation of a library, the publication of journals and books, and the establishment of a provident fund. From the beginning of the 20th century, the Association sought to concentrate technical professionals from the countryside into local sections, hence preventing the establishment of independent countryside associations. During the Dual Monarchy (1867–1918), 16 sections in the countryside were set up, and 4 more between the two world wars. The one in Pécs had been operating since 1930. The study describes the functioning of local sections, their relationship with the parent association and analyses their membership. It traces the history of the Pécs Section from its establishment to its liquidation in 1946, covering the changes in the composition of membership, the tasks and work of the officers, and the activities of this section as well as its relation to the Association. Among such activities, historical sources, recorded lectures, debates, field trips, social dinners, soirees, and exhibitions. Most of the members of the Pécs Section were engineers, as in the parent association, who worked in various technical offices in the city, such as the Hungarian Railways (MÁV) offices and in the coal mines of the Danube Steamship Company (DGT). However, the architects were also very active in the life of the Pécs Section, organising lectures, debates and exhibitions. The most significant local event of the period between the two world wars was the association’s 1936 travelling assembly held in Pécs, and the 1941 field trip. Despite the late establishment of the Pécs Section it was the largest and one of the most active local sections of the Hungarian Association of Engineers and Architects.
