ABSTRACT In this paper, the robust finite-time control for impact angle guidance of missile dynamic system with uncertainties is investigated by combining linear extended state observer (LESO) and adaptive non-singular fast terminal sliding mode method. Specially for dealing with existing uncertainties including time-varying parametric perturbation and nonparametric disturbances in high order line-of-sight rates and target acceleration, a robust LESO strategy is proposed for designing sliding mode-based impact angle guidance, which can guarantee that estimation error converges to the neighborhood of the origin in finite-time. Based on the proposed LESO framework, an adaptive non-singular fast terminal sliding mode guidance law is considered for realizing interception of maneuvering targets, which can guarantee asymptotically stability of the system. Simulation results are shown for confirming effectiveness of the proposed guidance strategy of this paper. Compared with former methods, accuracy of estimation is increased by nearly two times, and miss distance is reduced by nearly two times. paper finitetime finite time (LESO nonsingular non singular method timevarying varying lineofsight line sight acceleration modebased based finitetime. time. framework targets methods times

ABSTRACT India and Indonesia propose a bilateral cooperation to develop and operate telemetry, tracking, and control (TCC) ground stations to support satellite missions on geostationary orbits with the use of Geostationary Satellite Launch Vehicle (GSLV) since 1997, in order to master and commercialize space technology. This cooperation needs to be assessed in order to identify how it will affect Indonesia and India and to establish an improvement strategy for improved business and ways to integrate. The objectives of this paper are to (i) evaluate the benefits and cost of this cooperation, (ii) map the business model of the telemetry, tracking and command ground station in Biak, and (iii) design a new strategy to get competitiveness. Descriptive analysis with canvas mapping and transaction cost perspective is the approach utilized. The article’s results highlight that (i) Indonesia and India have mutual benefits from tangible and intangible side, (ii) Indonesia has a competitive advantage due to its geographic location and commercialization of Biak Ground Station, so its potential to Telemetry, Tracking, and Command (TT&C) commercial businesses in the future, not only to domestic, but also international market, and (iii) Indonesia needs collaborate with commercial entities and making optimum diplomation with G2B schema to get beneficially among parties to maximize TT&C infrastructure in Biak Island. telemetry TCC (TCC GSLV (GSLV 1997 technology integrate i (i ii (ii iii (iii competitiveness utilized articles article s side Station Telemetry Tracking TTC TT C (TT&C future domestic market GB G B Island 199 19 1

ABSTRACT Polymers based on glycidyl azide polymer (GAP) and isocyanate present molecular structures dependent on NCO/OH molar ratio and diisocyanate reactivity. In this study, GAP polymers are obtained from a reaction with aromatic (toluene diisocyanate, TDI) or aliphatic (isophoranediisocyanate, IPDI) diisocyanates, varying the NCO/OH molar ratio from equimolar to 2.5. The increment in NCO/OH molar ratio increases the gel fraction in GAP/TDI polymers up to 90 wt%, along with a progressive growth in their glass transition temperature (Tg), which rises 10 °C from NCO/OH equimolar to 2.5. In opposition, in the GAP/IPDI polymers, the maximum gel fraction is 20 wt%, and the Tg value practically does not change in NCO excess. Infrared spectroscopy shows the predominant presence of urethane groups in polymers containing up to 2.0 NCO/OH molar ratio; however, at 2.5, urethane and allophanate characteristic bands are present in both polymers. That reactivity is controlled by chemical kinetics since the activation barrier of the reaction between the GAP and TDI is 10 kcal.mol-1 lower than in the corresponding reaction with the IPDI. This difference results from the sum of the higher hyperconjugative interactions, approximately 65%, and the lower steric hindrance, about 35%, in the activated complex containing the TDI. (GAP NCOOH OH study toluene isophoranediisocyanate, isophoranediisocyanate (isophoranediisocyanate IPDI diisocyanates 25 2 5 2.5 GAPTDI 9 wt wt% Tg, , (Tg) 1 C opposition GAPIPDI excess 0 2. however kcal.mol1 kcalmol1 kcalmol kcal.mol kcal mol kcal.mol- interactions 65 65% hindrance 35 35% (Tg mol1 6 3

ABSTRACT This article proposes a new approach to implement a quality management system’s strategic structure that incorporates prospective scenarios analysis in the determination of strategic elements, such as quality policy, mission, vision, needs, and objectives. The qualitative analysis of managers’ statements about how the results were perceived revealed a significant change in strategic structure of a study case organization within the Department of Science and Aerospace Technology. This main result of this approach lies in the reorientation of managerial focus, prioritizing organizational needs management. This realignment culminates in superior results, obtained through effective actions aimed at fully satisfying these needs, thus marking a break with historical management practices. systems system s elements policy mission vision objectives managers Technology focus practices

ABSTRACT Small multirotor unmanned aerial systems (sUAS) have become more accessible and efficient recently, spurring their development for various personal and commercial uses. However, this rapid evolution raises concerns about security, control, and public health due to the proliferation of noisy drones. This study focuses on investigating a major noise source in drones called rotor-airframe interaction, which generates tonal noise through pressure fluctuations and wake interactions. To address this issue, we designed and tested three airframes with varying arm configurations. High-definition microphones and data acquisition systems were employed to measure pressure levels, and MATLAB code helped analyze the data as A-weighted signals to identify noise reduction possibilities. The key finding was that motor noise was a significant contributor, producing multiple pure tones at mid and high frequencies. Additionally, the noise signature was heavily influenced by the arm’s geometric shape and angles, underscoring the complex nature of rotor-airframe flow and acoustic interactions. sUAS (sUAS recently uses However security control rotorairframe rotor airframe interaction interactions issue configurations Highdefinition High definition levels Aweighted A weighted possibilities contributor frequencies Additionally arms s angles

ABSTRACT This study investigates the issue of multi-objective mission planning for multi-payload satellite constellations via the non-dominated sorting carnivorous plant algorithm (NSCPA). Observation time windows are generated, and a constraint satisfaction model is established based on multiple regional targets, satellite orbits, and characteristics of the synthetic aperture radar (SAR) payload and optical payload. A task conflict detection and resolution method is proposed to handle the task assignment among multiple satellites. Based on the existing single objective-based CPAs, a modified multi-objective NSCPA is first developed for multi-objective planning optimization using the non-dominated sorting algorithm. The effectiveness and superiority of the NSCPA are verified by a series of simulation experiments and comparisons with the traditional non-dominated sorting genetic algorithms-II (NSGA-II) and particle swarm optimization (PSO). multiobjective multi objective multipayload nondominated non dominated NSCPA. . (NSCPA) generated targets orbits SAR (SAR satellites objectivebased CPAs algorithmsII algorithms II NSGAII NSGA (NSGA-II PSO. PSO (PSO) (NSCPA (PSO

ABSTRACT The research relevance is predefined by the air travel number growth. Accordingly, the relevance of this issue is increasing, especially concerning air travel safety. Also, due to the increasing demand for international flights, it becomes essential to harmonize the standards and methodology of training aviation personnel. The research aims to consider the parameters of flight safety and the impact of the unification of training programs for aviation personnel. The conclusion that unification can significantly affect safety was made with the help of scientific and special methods, including analysis, synthesis, concretization, and generalization. An analysis of existing unification methods was conducted. The multi-crew pilot training program proved to be one of the most advanced compared to standard flight crew training programs. The method was determined to be a specialized training program tailored to the needs of the aviation industry and focused on training pilots for multi-crew and jet operations. The program is more challenging, intensive and dynamic, and includes a significant amount of simulator training. Traditional flight training programs, such as Private Pilot Licenses (PPL), Commercial Pilot Licenses (CPL), instrument qualification, and multi-engine rating, have a broader scope and provide pilots with more career opportunities. Simulator training has been identified as a critical component of many flight training programs and plays a vital role in flight safety. The study may be of interest to a range of readers concerned with the issue of standardizing aviation training and improving safety in aviation, including researchers, faculty, and students of higher education institutions in the aviation field. growth Accordingly Also flights personnel synthesis concretization generalization conducted multicrew multi operations challenging dynamic PPL, PPL , (PPL) CPL, CPL (CPL) qualification multiengine engine rating opportunities researchers faculty field (PPL (CPL

ABSTRACT Understanding of various aerodynamic factors involved in flight trajectories is fundamental to design launch vehicles. First and foremost, computer simulation is an efficient way of predicting its behavior in the movement across the atmosphere. Considering that the available Brazilian version of Analysis, Simulation and Trajectory Optimization Software for Space Applications (Astos) does not simulate a controlled vehicle in six degrees of freedom (DoF), the aim of this article is to complement the Astos outcomes, particularly evaluating the trajectory of a controlled launch vehicle from liftoff to orbit injection, considering the model of rigid body dynamics with a six DoF. This approach carried out with an in-house developed simulator called Scott that simulated a multistage launcher with three flight configurations. In the Scott computer program, a launcher was modeled with differential equations in six DoF, coupled axes attitude control system, and aerodynamic coefficients that changed as a function of Mach number. These features improved the results generated by Astos software for the same configurations and the same initial conditions. Additionally, the results provided by Scott were close to actual vehicle in terms of attitude change and Mach number reached. vehicles foremost atmosphere Analysis (Astos DoF , (DoF) outcomes injection inhouse house program system conditions Additionally reached (DoF

ABSTRACT Gaussian mixture probability hypothesis density (GM-PHD) filtering often assumes a uniform distribution of clutter in the observation area. However, in practice, clutter is often unknown and non-uniform, necessitating accurate estimation of its spatial distribution, non-uniformity, and temporal variations. To address this problem, we proposed a modified GM-PHD filtering method with clutter density estimation for multiple target tracking. In the proposed method, first, potential target measurements within the tracking gate are eliminated to obtain the clutter measurement set. Next, the clutter density around each target is estimated. Finally, the estimated clutter density is incorporated into GM-PHD filtering, to estimate the target state and clutter density in complex clutter environments. Simulation results demonstrated that the proposed filtering method improves the performance of the GM-PHD filter in multi-target tracking scenarios with unknown clutter density. GMPHD GM PHD (GM-PHD area However practice nonuniform, nonuniform non uniform, non-uniform nonuniformity, nonuniformity uniformity, uniformity non-uniformity variations problem first set Next Finally environments multitarget multi

Abstract Recently, solar energy has become most favorable source of energy. It is sustainable and environmentally friendly, and one of the most common application of solar energy is the solar water heater, which has a wide commercial and domestic applications. To enhance the performance of this device, many modifications are recommended. The enhancements may involve changes in pipe shape or materials or in absorber plate manufacturing, or sometimes by using a thermal storage tank to maintain heating. In this study, a variable cross-sectional area pipe is used to enhance heat transfer. Firstly, the vertical length is increased at the outlet to 1.2-1.8 ratios, while the horizontal sides remain constant. Then, for the same ratio, the horizontal sides are varied while the vertical sides remain constant. Finally, both the vertical and horizontal sides are increase. A three-dimensional numerical analysis is used to investigate the conjugated heat transfer and the flow characteristics in the pipe under study for each case. FLUENT ANSYS 17.2 is used to achieve this analysis using finite volume technique. Energy, Navier-Stokes, and continuity equations are solved at constant heat flux condition for a range of Reynolds numbers from 100 to 500. The hydraulic-thermal function ε is adopted in this study. The best increase in ε is 48%, achieved in the case of changes to both vertical and horizontal dimensions at a ratio of 1.8. The lowest percentage of decrease in pressure drop is 9.7%, and the highest temperature difference found is and 45.5% for the same case when compared with the uniform case for Reynolds number of 100. The present work is validated with another study adopting Shah’s empirical relation with a very good agreement. Recently friendly heater applications device recommended manufacturing heating crosssectional cross sectional Firstly 1.21.8 1218 1.2 1.8 1 2 8 1.2-1. ratios Then Finally threedimensional three dimensional 172 17 17. technique Energy NavierStokes, NavierStokes Navier Stokes, Stokes Navier-Stokes 10 500 hydraulicthermal hydraulic 48 48% 18 97 9 7 9.7% 455 45 5 45.5 Shahs Shah s agreement 21 1.21. 121 12 1. 1.2-1 50 4 9.7 45. 1.21 1.2- 9.

ABSTRACT This article provides a detailed look at how cyclotrimethylenetrinitramine (RDX), cyclotetramethylene-tetranitramine (HMX), and hexanitrohexaazaisowurtzitane (HNIW or CL-20) are currently being used for energy purposes in both civilian and military environments around the world. It highlights the significance of monitoring and prospecting for new technologies to promote innovation in developed and developing countries. This research was carried out by systematically analyzing nonpatent documents and patents from reputable databases such as Scopus, Derwent, and Espacenet. The report recognizes patent documentation as a valuable source of technical information and explores how analyzing patents can provide insights into using and developing high-performance compounds. Moreover, the article discusses the versatile applications of RDX, HMX, and CL-20, which are highly explosive substances that have found uses in multiple sectors. It delves into these materials’ chemical composition, structure, and importance in military and industrial contexts. The research methodology involved thoroughly searching and filtering documents from databases, focusing on titles, abstracts, and keywords. The results show the annual growth of publications related to the three explosive compounds and highlight the main research fields associated with each fabric. Overall, this article provides valuable insights into using and developing powerful compounds. It emphasizes the importance of technological monitoring and patent analysis in shaping strategic decision-making and fostering innovation. It is a foundation for further research and exploration of energetic materials and their applications. RDX , (RDX) cyclotetramethylenetetranitramine cyclotetramethylene tetranitramine HMX (HMX) HNIW CL20 CL 20 CL-20 world countries Scopus Derwent Espacenet highperformance high performance Moreover CL20, 20, sectors composition structure contexts titles abstracts keywords fabric Overall decisionmaking decision making (RDX (HMX CL2 2 CL-2 CL-

Abstract Despite a global increase in the number of passengers with disabilities on regional aviation, most aircraft cabins are still not adequately equipped to provide sufficient comfort to this public, making the travel experience much less attractive. In order to investigate how airlines and aircraft manufacturers could improve the cabin’s accessibility, this study aims to investigate solutions and systems available in the market to propose an accessible cabin concept for regional aviation. This research is part 2 of a two-part series that aims to apply a methodology inspired by Design Thinking Tools such as persona mapping to suggest improvements for the experience of passengers with disabilities. To this end, potential systems were evaluated and a cabin concept was proposed. It was noted that for passengers with sensory impairments, it is possible to improve their experience without major cabin modifications. However, research on their needs is limited and there are few solutions on the market targeting this audience. Conversely, passengers with mobility restrictions pose more complex challenges. Finally, the proposed accessible cabin concept demonstrates the potential to enhance the flight experience for passengers with special needs, potentially increasing their market share and overall satisfaction. aviation public attractive s accessibility twopart two end impairments modifications However audience Conversely challenges Finally satisfaction

ABSTRACT The global increase in the number of passengers with disabilities in the aviation market raises the need for airlines to offer an inclusive service to these groups, which can represent a differentiation in the market. This paper is part 1 of a two-part series where it was proposed to apply a methodology inspired on Design Thinking, with tools such as persona mapping and user’s journey to define requirements and propose a concept for an accessible cabin. In this part, bibliographic research, with study of other papers that investigated the aviation market and mapped the complaints and needs of users with disabilities were initially carried out. The result of these researches served as the basis for the application of the methodology and definition of needs and requirements for an accessible cabin concept. It was concluded with this work that it is crucial to consider the needs of all stakeholders involved in the system for the good definition of the needs, that is, users, manufacturers, and airlines, since modifications to the cabin can affect important parameters such as cost and weight, and must be made to address points that can really improve the user experience. It was noted that research is limited for passengers with sensory impairments making it harder to clearly define their needs. Passengers with mobility restrictions, on the other hand, are better represented in research. Finally, the proposed list of needs demonstrates the potential to enhance the flight experience for passengers with special needs, potentially increasing their market share and overall satisfaction. groups twopart two Thinking s out manufacturers weight restrictions hand Finally satisfaction

ABSTRACT The concept of a swarm of drones assumes the presence of a wireless ad hoc network, in which drones are network nodes and exchanging information with each other. This article is devoted to studying the behavior of an ad hoc network in a transient mode and assessing the characteristics of updating local adjacency matrices (LAM), which allow network nodes to autonomously form packet transmission routes. Using a simulation model, a comparison was made of two multiple access methods to a common data transmission channel in the process of updating matrices: cyclic and random (slotted ALOHA). The simulation results made it possible to determine areas of their effective application: slotted ALOHA is advisable to use with relatively high probabilities of packet distortion (of the order of 0.1 and higher), a numerous nodes (more than 40), and low network connectivity, and cyclic access (CA) is effective at a low level of distortion. It is shown that the completion of the process of updating adjacency matrices (AM) can be judged by such indicators of the exchange of routing information as the achievement of a certain threshold of the number of transmissions and a decrease in the level of network traffic. other LAM, LAM , (LAM) routes model ALOHA. . ALOHA) application 01 0 1 0. higher, higher higher) more 40, 40 40) connectivity CA (CA AM (AM traffic (LAM 4