Design Goals Research Articles

Effects of Urban Green Space's Physical Features on the Usability of Investment Housing Projects in Erbil City

In the quest to improve urban quality of life, creating functional and visually appealing urban green spaces plays a pivotal role. This study investigates the influence of five key physical characteristics—availability, maintenance, facilities, environment, and design—on the usability of urban green spaces in three case studies in Erbil: Italian City 2, Hewa City, and Ashti City 2 neighborhoods. The research aims to understand how urban green spaces impact investment housing projects, analyze the relationship between physical factors and urban design usability and explore individuals' perceptions regarding the influence of these factors on urban green space design. Through systematic observation and visual analysis of residential areas, the study reveals that these five physical qualities of green spaces consistently scored above 90%, indicating a strong alignment with usability elements. This suggests that these physical attributes significantly enhance the usability of urban green spaces, which, in turn, supports broader urban design goals. This research highlights the importance of integrating these physical characteristics when planning and designing urban green spaces, particularly within the context of investment housing projects in Erbil's case study neighborhoods. Such enhancements can positively impact urban development and residents' quality of life. Future research should delve into the long-term socio-economic effects of these green space improvments.

Research on Innovative Training of Localized STEM Teachers Grounded in Shared Commitment

The high-quality development of a country driven by talent necessitates comprehensive and practical STEM (Science, Technology, Engineering, and Mathematics) education. The goal of localizing STEM education is to cultivate comprehensive innovative technology talents that meet the needs of the new era. STEM teachers play a core role in this concept, and the quality of teacher training directly determines the development trend of STEM education and the quality of future talents in the country. Therefore, based on the current situation and existing problems in STEM teacher training, the shared commitment to “high-quality STEM teacher training” is employed as a guiding principle, highlighting the role of various elements in the STEM teacher training process. The practical path for STEM teacher training is proposed from four aspects: top-level design goal orientation, resource integration to solve supply imbalance, curriculum construction to improve the teaching system, and sustainable development to enhance professional ability. This study hopes to provide guidelines for innovative training of localized STEM teachers in China.

Local Green Marketing Business Environmental Regulatory Framework for Bataan MSME Food Processing: Consultative Development Process

The overarching goal of this exploratory sequential mixed methods design is to evaluate the environmental practices of specific small and medium enterprises (SMEs) in Bataan, Philippines, with a focus on green marketing aspects such as raw material usage, energy consumption, water conservation, waste management, air emissions, and wastewater treatment. Additionally, the study investigates the degree of public involvement in formulating regulations related to green marketing. Respondents, comprising business owners and local government officials, were chosen through a two-step cluster sampling method for quantitative analysis and purposeful sampling for qualitative insights. More so, it revealed a consistent implementation of environmentally friendly practices and green marketing management among SMEs. Interviews with business owners and local government officials yielded positive responses regarding the development of local green marketing policies, particularly for businesses in the food processing sector. Through the analysis and interpretation of collected data, the study provided valuable insights guiding the formulation of a regulatory framework for green marketing. Keywords: green marketing, environmental performance, environmental management, food processing, micro small medium enterprises, eco-labeling policy.

Analyzing Grocery Items Inventory and Managing Stock

Analyzing Grocery items inventory and managing stock is a software application designed to help grocery stores manage their sales processes and inventory. The system typically includes features such as inventory management, point of sale (POS) functionality, and reporting. With a Grocery Items, grocery stores can keep track of their inventory levels, manage their sales transactions, and generate reports on sales and inventory data. This can help grocery stores improve their operations, reduce waste, and provide better customer service. The system works by integrating with the store's POS system, allowing sales data to be automatically recorded and tracked. The system can also be used to manage inventory levels, track product expiration dates, and generate reports on sales and inventory data. Overall, a Grocery items inventory and managing stock can be a valuable tool for grocery stores looking to optimize their operations and improve their bottom line. The goal of the database design for the grocery management system is to facilitate the automated processing of products purchased, billing, and purchases made, as well as to maintain and safeguard sales records. Both the owner and the employee find it easier to control and manage the company's transactions with its support. You won't have to spend as much time manually entering every detail of the customer's and company's transaction. All of the company's data and information is processed and stored by my system. Java and its link to PHP/My Admin are the building blocks of this system. Everything from customers and employees to products and sales figures as well as payment details will be saved in the system's database. The user can keep track of the sale or item that the customer is reserving with my basic silver cross grocery management system. Only authorised users with the staff administrator role can access the Cashier system.

Analysis and Simulation on Thermal Behavior of Cryogenic Tank for Different Types of Internal Support Materials

The cryogenic vessel is mainly a double-walled vessel which mainly consists inner vessel, outer vessel, and inner support. The Inner support is the main part designing of the cryogenic vessel for thermal and structural criteria. Inner support material for cryogenic vessels can be made of various materials depending on Net evaporation rate (NER) criteria and structural criteria (i.e. road transport, marine transport, space condition). Material for the Inner support structure has low thermal conductivity and high strength, low weight. To meet the design goal for very low thermal conductivity, high strength, and low weight the next-generation materials like carbon fibber and polymeric-based composites are being developed for cryogenic fuel tank applications. By using different materials like SS304, G-10, Inconel, Invar-36, High strength Carbon fibber, and polymer-based composites same support structure will be analysed in FEA software for Thermal and structural conditions and will compare for different load conditions to check structural integrity. Also will compare the impact of different materials on NER and holding day for cryogenic fluid

Enhancing Student Well-being: Transformative Art Education and Evaluation

This research explores the profound impact of art courses on students' emotional well-being and personal growth, while also examining the relationship between learning and evaluation. Through diverse evaluation methods such as design teaching observation, team collaboration, communication and exchange analyses, and evaluation scales, the study assesses the achievement of course design goals and the transformative potential of art education. This investigation underscores the significance of arts-infused pedagogy in fostering holistic learning outcomes beyond traditional academic measures.

Semiparametric Allocation of Subjects to Cohort Strata.

We illustrate a method for stratum assignment in small cohort studies that avoids modeling assumptions. Off-the-shelf software ( rgenoud ) made stratum assignments to minimize a loss function built on within-stratum and population-adjusted Euclidean distances. In 100 trials using simulated data of 300 records with a binary treatment and four dissimilar covariate treatment predictors, minimizing a loss based on Euclidean distance reduced covariate imbalance by a median of 99%. Stratification by propensity score and weighting records by the inverse of their probability of treatment reduced imbalance by 76%-89% and 83%-94%, respectively. Loss minimization applied to a cohort of 361 children undergoing immunotherapy achieved nearly complete elimination of covariate differences for important treatment predictors. With the availability of semiparametric stratum-assignment algorithms, analysts can tailor loss functions to meet design goals. Here, a loss function that emphasized covariate balance performed well under limited testing.

SAFIR-I: first NEMA NU 4-2008-based performance characterization

BackgroundSmall Animal Fast Insert for MRI detector I (SAFIR-I) is a novel Positron Emission Tomography insert for a 7T\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$7\\,\\hbox {T}$$\\end{document} Bruker BioSpec 70/30 Ultra Shield Refrigerated Magnetic Resonance Imaging (MRI) system. It facilitates truly simultaneous quantitative imaging in mice and rats at injected activities as high as 500MBq\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$500\\,\\hbox {MBq}$$\\end{document}. Exploitation of the resulting high count rates enables quick image formation at few seconds per frame. In this investigation, key performance parameters of SAFIR-I have been determined according to the evaluations outlined in the National Electrical Manufacturers Association (NEMA) Standards Publication NU 4-2008 (NEMA-NU4) protocol.ResultsUsing an energy window of 391 to 601keV\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$601\\,\\hbox {keV}$$\\end{document} and a Coincidence Timing Window of 500ps\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$500\\,\\hbox {ps}$$\\end{document}, the following performance was observed: The average spatial resolution at 5mm\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$5\\,\\hbox {mm}$$\\end{document} radial offset (Full Width at Half Maximum) is 2.54mm\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$2.54\\,\\hbox {mm}$$\\end{document} when using Filtered Backprojection, 3D Reprojection reconstruction. For the mouse- and rat-like phantoms, the maximal Noise-Equivalent Count Rates (NECRs) are 1368kcps\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$1368\\,\\hbox {kcps}$$\\end{document} at the highest tested average effective concentration of 14.7MBqcc-1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$14.7\\,\\hbox {MBq}\\,\\hbox {cc}^{-1}$$\\end{document}, and 713kcps\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$713\\,\\hbox {kcps}$$\\end{document} at the highest tested average effective concentration of 1.72MBqcc-1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$1.72\\,\\hbox {MBq}\\,\\hbox {cc}^{-1}$$\\end{document}, respectively. The NECR peak is not yet reached for either of these cases. The peak sensitivity is 1.46%\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$1.46\\,\\%$$\\end{document}. The Image Quality phantom uniformity standard deviation is 4.8%\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$4.8\\,\\%$$\\end{document}. The Recovery Coefficient for the 5mm\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$5\\,\\hbox {mm}$$\\end{document} rod is (1.08±0.10)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$(1.08 \\pm 0.10)$$\\end{document}. The Spill-Over Ratios are (0.22±0.03)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$(0.22 \\pm 0.03)$$\\end{document} and (0.22±0.02)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$(0.22 \\pm 0.02)$$\\end{document}, for the water- and air-filled cylinder, respectively. An accuracy of 4.3%\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$4.3\\,\\%$$\\end{document} was achieved for the quantitative calibration of reconstructed voxel values.ConclusionsThe measured performance parameters indicate that the various design goals have been achieved. SAFIR-I offers excellent performance, especially at the high activities it was designed for. This facilitates planned experiments with fast tracer kinetics in small animals. Ways to potentially improve performance can still be explored. Simultaneously, further performance gains can be expected for a forthcoming insert featuring 2.7 times longer axial coverage named Small Animal Fast Insert for MRI detector II (SAFIR-II).

The efficiency of bio-char as bitumen modifier

Improving the mechanical properties of bitumen is an important goal for road pavements design. For this reason, new compounds are now being sought for testing as bitumen modifiers.In this work, the authors studied the effect that two different chars have on two 50/70 bitumens with different chemical and physical characteristics. A complete morphological, surface and bulk characterization of the two additives was carried out. In addition, rheology, Nuclear Magnetic Resonance (NMR) relaxometry and atomic force microscopy were used to analyze the effect that the two additives exert on the properties of the bitumens. According to the results, the char sample with high porosity could be used as a modifier of mechanical properties, while no rejuvenation effects were observed for either of the two additives tested. In addition, the two additives do not give rise to segregation phenomena.

Substituent effects on the emission quantum efficiency in pyrene-based luminogens featured two-photon absorption: A theoretical and experimental study

Pyrene-based luminogens have attracted significant attention for their potential applications in organic electronics, nonlinear optics and bioimaging. The attainment of a large two-photon absorption (TPA) cross section (σtpa) and a high emission quantum efficiency (Φf) are crucial goals in material design. However, the intrinsic modulation guidelines have rarely been revealed. In this study, we investigated the substituent effects on the excited-state properties in pyrene-based donor-π-acceptor (D-π-A) dyes. In the dimethyl sulfoxide (DMSO) solution, we performed first-principles calculations on σtpa, Φf and the TPA brightness (σtpa × Φf). The results demonstrate that both the H-parent compound and F-substituted derivative exhibit high Φf values. Nevertheless, they have low σtpa values due to the weak push-pull effect, resulting in small σtpa × Φf values in solution. Conversely, the CHO-substituted derivative has high σtpa and Φf values, leading to a large σtpa × Φf. However, the NMe2-substituted derivative possesses high σtpa but relatively low Φf owing to the small energy gap. Therefore, it has a modest σtpa × Φf in solution. In the solid state, we conducted experimental measurements to determine Φf. It is found that the solid powders of the H-, F- and CHO-substituted derivatives show considerably lower Φf values compared to the DMSO solution. In contrast, the NMe2-substituted derivative displays a higher Φf. The discrepant Φf values can be attributed to the different patterns in which the dimers pack themselves in the aggregated state. Our study not only provides a deep understanding for the photophysical properties of pyrene-based luminogens, but also lays the groundwork for the rational design of efficient two-photon fluorescent emitters.

Drainage of road bridges

Abstract When designing bridges, the main focus is usually on the design of structural elements. However, some important issues related to the safe operation and maintenance of these facilities are sometimes ignored. One such issue is related to the drainage of bridge roadways. In some countries with a well-working system of inspection and maintenance of road networks and of bridges in particular, there are clear rules for the design of bridge drainage. Unlike the common practice in Bulgaria, the goal of bridge drainage design in these countries is to minimize the number of scuppers and to look for appropriate ways to minimize the amount of water in the bridge area. In this paper, the available requirements of Bulgarian design documents and regulations related to drainage systems are studied and a comparison with the bridge design manuals of some US transportation administrations is made

A Scalable PDC Placement Technique for Fast and Resilient Monitoring of Large Power Grids

The Wide Area Measurement System (WAMS) is a key enabler of real-time monitoring of power grids. The essential goals of WAMS design are fast and resilient data transfer from phasor measurement units (PMU) to phasor data concentrators (PDC). We propose a scalable two-stage PDC placement technique for minimizing the end-to-end delay while maintaining resiliency. In the prescreening stage, the plausible candidates of PDC configurations are identified based on a graph theory-based multi-median function (MMF). A computationally efficient meta-heuristic algorithm is used to address scalability. In the candidate selection stage, two different algorithms, namely Suurballe's and Dijkstra's, are employed to identify the best of those plausible PDC configurations as the final design. This technique not only minimizes the hop paths between PMUs and PDCs, but also ensures network resiliency against single PMU, PDC, or communication link failure by incorporating the roles of PMUs in power grid observability into routing policy. Simulation results on the IEEE 57-bus test power system and the 2000-bus test power system demonstrate the effectiveness and scalability of the proposed technique.

Exploring new frontiers in gridshell design: The FreeGrid benchmark

Gridshell structures require an intricate design activity that shall comply with several design goals of diverse nature. This design phase can be approached with different methods and strategies and usually requires multiple competencies from different scientific fields. In this context, a common benchmark, called FreeGrid, is proposed to the scientific and practitioners’ communities in order to test and compare different approaches to the design and optimization of steel gridshells on the bases of ad-hoc defined performance metrics. FreeGrid sets three design baseline problems: a barrel vault, a parabolic dome, and a hyperbolic paraboloid, having their spring line partially not constrained (free-edge) and subjected to uniform and piecewise uniform load conditions. Participants are called to modify the baseline gridshell(s), observing a limited number of design constraints (related to geometry, external constraints and material), in order to improve their structural, buildability, and sustainability performances through the maximization of a bulk quantitative performance metric. Specifically, the structural performance metric accounts for both ultimate and serviceability behavior, through the calculation of the critical Load Factor and maximum vertical displacement; the buildability performance metric includes the evaluation of face planarity, uniformity of structural joints and members; the sustainability performance metric is based on the structure embodied carbon. This paper describes the baseline gridshells setups, the proposed performance metrics and the recommended method for performance assessment. The complete data of the baseline structures are made available according to an Open Data policy, together with postprocessing utilities intended to align the procedure to obtain the performance metrics.

Design, analysis, and testing of a new asymmetric vibration-assisted stage for roll-type polishing.

Based on the technological characteristics of roll-type polishing, a new asymmetric vibration-assisted stage is proposed in this paper. This stage is characterized by asymmetric displacement and asymmetric stiffness. With the average particle spacing of roll-type polishing as the constraint, the comprehensive characteristics of structural stiffness, kinematic range, and natural frequency are realized. Thus, to reduce the surface roughness, the removal of simple-directional surface textures generated by roll-type polishing can be achieved. First, the asymmetric structure is designed, modeled, and optimized according to working performance design goals of roll-type polishing. Then, the finite element analysis and actual performance test of the stage are carried out to verify the accuracy of the established model and the effectiveness of the optimization design. The results indicate that the stage can meet the design index. Finally, the asymmetric vibration-assisted polishing experiment is carried out. The results show that the single-directional surface textures of the SiC surface are interrupted and the surface roughness is decreased.

Hybrid-electric power unit for an ultralight aircraft

High power-weight ratio, reliability and efficiency are the main design goals for the propulsion system of ultralight aircraft (mass up to 650 kg). For power outputs beyond 40 kW, 4-stroke multi-cylinder SI engines are the most widespread solution, while pure electric powertrains do not appear at the moment as a practical proposition. Four stroke diesel engines would also be very attractive, in particular for military applications, but their weight is significantly higher than their gasoline powered counterpart. The goal of the study presented in this article is to develop a hybrid-electric power unit for ultralights, running on heavy fuels (diesel, kerosene, jet fuels). Reference is made to Falco EVO, by Leonardo, originally equipped by the Rotax 912 ULS/S engine (peak power 73.5 kW, weight about 60 kg): the proposed power unit has the same cylinders layout, smaller overall dimensions and almost equivalent weight. The thermal engine is an innovative two-stroke unit, coupled in parallel to a permanent magnet electric motor. The design and optimization of the hybrid power unit has been supported by CAE tools, including CAD and CFD simulations.The results of the study show that the new hybrid system can save about 30% of fuel mass at the typical cruise conditions, and it can increase the peak power output up to 20%, compared to the reference Rotax engine. The reduction of fuel consumption can be translated into an equivalent increment of the operative range of the aircraft, or into an increase of payload (+30%, considering the Falco EVO aircraft). Finally, compared to the Rotax engine, the hybrid power unit exhibits significantly lower CO2 emissions (from -12% to -37%), thanks to the improvement of fuel efficiency.

Fiber Optic Sensor-Based Bearing Defect Detection and Its Usages in Computer Vision

This work focuses on the investigation of surface defects in small bearings. Based on the theory of rough surface scattering and the dual-beam ratio measurement method, fiber optic sensing technology is applied in identifying surface defects in bearings. To facilitate the extraction of features for surface defects in bearings, a sensor probe fiber array with three concentric circles around the central emission is determined. A reflective intensity-modulated fiber optic sensor (FOS) is employed to detect surface defects on bearings. The structural parameters of the FOS are simulated through Matlab, considering the inner/outer diameter, numerical aperture, and axial spacing of the sensor. This work involves designing modulation light source excitation circuits, photoelectric conversion module circuits, pre-amplification differential amplifier circuits, infinite gain bandpass filtering circuits, and window function comparison circuits. This effectively amplifies the defect feature signals and eliminates noise interference. In experiments, the sensor probe is fixed on the support of a micro-displacement measurement platform. By adjusting the distance between the probe and the side surface through rotation, initial tests are conducted using standard roughness samples. The results indicate that installing the sensor probe at a distance of 0.92 mm from the side surface provides better measurement of surface roughness. The oscilloscope waveform reveals that the FOS can identify defects on different bearing surfaces. Furthermore, the bearing surface is divided into sections with engraved text (seal cover part) and without engraved text (inner and outer rings of the bearing). Using computer vision (CV) technology, a FOS detection system is designed, achieving a defect recognition rate of 99% for bearings, in line with the intended design goals.

On ecologically-safe high-speed vehicles: Conceptual design study of the next generation supersonic transport

Space-age technology makes it possible to travel faster than the speed of sound from one continent to another one or even to make suborbital flight as a space tourism. The existing technology challenge is to bring this innovative way of travel without damaging the environment to ensure human safety and to preserve environment balance. The sonic boom issue is one of the concerns when flying faster than sound. The issue must be taking into account at the stage of developing environmentally friendly high-speed vehicle. The next generation supersonic transport is fundamentally different from subsonic medium- and long-range aircraft in a breakthrough feature: it ensures a long-term supersonic cruise flight in the range of Mach numbers 1.6–1.8. For a successful implementation of the civil supersonic project at a new stage of technology development, it is necessary to solve a number of scientific and technical problems. In the present paper some of them are under discussion. In particular, the addressed issues are as follows: how to achieve a high level of aerodynamic efficiency at supersonic cruise along with low sonic boom; how to fit into low noise requirements at take-off and landing modes of supersonic aircraft with a moderate-bypass-ratio engine; how to implement a wing with high load factor and fuselage with long nose part to fit into required airframe structural stiffness, etc. Also, new technology approaches in multidisciplinary optimization task to achieve aircraft design goals of low drag, low boom and low noise characteristics are discussed. A few examples of optimal supersonic aircraft configurations along with passenger cabin are given. The paper was presented at the X-th IAA Symposium “Space Flight Safety” in St.-Petersburg on June 2023.

Design Implementation and Performance Optimization of Battle Royale Games

Battle Royale games are a type of multiplayer online games where players compete against each other in a virtual world until only one survivor remains. The design goal of these games is to provide a thrilling gaming experience and to improve the fluidity and responsiveness of the game through performance optimization measures. In this context, Call of Duty (COD) and Apex Legends (APEX) have become two representative Battle Royale games in the modern video game market, winning the affection of a vast number of players with their rich gaming experiences and high levels of player interaction. This study conducts an in-depth discussion on the design, implementation, and performance optimization strategies of these two games. Through the detailed analysis of the design concepts and core mechanisms of these games, valuable reference is provided. With the design and optimization of future Royale games, it has contributed to the technological progress in the field of game development.

Real-data-driven real-time reconfigurable microwave reflective surface

Manipulating the electromagnetic (EM) scattering behavior from an arbitrary surface dynamically on arbitrary design goals is an ultimate ambition for many EM stealth and communication problems, yet it is nearly impossible to accomplish with conventional analysis and optimization techniques. Here we present a reconfigurable conformal metasurface prototype as well as a workflow that enables it to respond to multiple design targets on the reflection pattern with extremely low on-site computing power and time. The metasurface is driven by a sequential tandem neural network which is pre-trained using actual experimental data, avoiding any possible errors that may arise from calculation, simulation, or manufacturing tolerances. This platform empowers the surface to operate accurately in a complex environment including varying incident angle and operating frequency, or even with other scatterers present close to the surface. The proposed data-driven approach requires minimum amount of prior knowledge and human effort yet provides maximized versatility on the reflection control, stepping towards the end form of intelligent tunable EM surfaces.

A multi-degree-of-freedom reconfigurable ankle rehabilitation robot with adjustable workspace for post-stroke lower limb ankle rehabilitation

Introduction: A multi-degree-of-freedom ankle rehabilitation robot with an adjustable workspace has been designed to facilitate ankle joint rehabilitation training. It features a rotation center adapted to the human body, making it suitable for patients with ankle dysfunction following a stroke.Method: In this study, a multi-degree-of-freedom reconfigurable ankle rehabilitation robot (RARR) with adaptable features, based on the principles of ergonomics, has been proposed to cater to the varying needs of patients. This robot offers an adjustable workspace, allowing for different types of ankle joint rehabilitation exercises to be performed. By adjusting the assembly of the RARR, personalized and targeted training can be provided to patients, circumventing issues of redundancy in degrees of freedom during its use. A kinematic model of the robot has been established, and finite element simulation has been employed to analyze the strength of critical components, ensuring the safety of the robot. An experimental platform has been set up to assess the smoothness of the rehabilitation process with RARR, with angle measurements conducted using an Inertial Measurement Unit (IMU).Results and discussion: In conclusion, both simulation and experimental results demonstrate that the robot offers an adjustable workspace and exhibits relatively smooth motion, thereby confirming the safety and effectiveness of the robot. These outcomes align with the intended design goals, facilitating ankle joint rehabilitation and advancing the field of reconfigurable robotics. The RARR boasts a compact structure and portability, making it suitable for various usage scenarios. It is easily deployable for at-home use by patients and holds practical application value for wider adoption in rehabilitation settings.