Take-off Stage Research Articles

Barriers to Enrolment into Health Insurance Schemes in Nigeria: The case of Niger State Contributory Health Insurance Scheme

Niger State government has keyed into the health insurance program of the federal government since 2019, with the establishment of the Niger State Health Insurance Scheme. Although the scheme has beautiful mission for the formal and the informal sector workers as well as the students in tertiary institutions and the vulnerable groups, it is yet to enjoy reasonable patronage. Studies on barriers to enrolment into health insurance were mostly conducted in matured health insurance settings, where barriers to enrolment do with operational concerns. It is not clear whether operational concerns may affect enrolment in Niger State where the health insurance scheme is at the take-off stage. Using qualitative research design to explore the enrolment barriers, this study has drawn a sample of 22 respondents across the major tribes, religions, enrolment category and senatorial zones of the state. Four enrolment officers were also part of the respondents. An in-depth interview was conducted on the respondent and the results were analysed in themes. The findings of the study showed that lack of trust in anything government is the major barrier to enrolment among the public sector workers due to their prior experiences of failed schemes run by government. However, inadequate sensitization about the requirements, procedures for enrolment, cost and benefits of the scheme were the barriers to enrolment among the informal and the private sector workers. The enrolment of the vulnerable groups is undermined by the lack of social register from where the list of the qualified people would be extracted. In addition, the lack of National Identification Number, which is the pre-requisite for enrolment, deters enrolment of the vulnerable groups. The problem of insecurity in the state also affects outreach and enrolment. Necessary suggestions are given to the government.

Kinematic characteristics analysis of highly difficult movements "324C+1D" of the first level Wushu athletes

Background "324C+1D” movements are key techniques and winning factors in Wushu competitions. It is necessary for scientific training to analyze the kinematic characteristics of “324C+1D” by using the method of sports biomechanics. Methods In this study, 3D high-speed camera and 3D motion analysis software were used to study “324C+1D” completed by three Chinese wushu first-level athletes, and the kinematic characteristics of this movement were obtained. Results The run-up speed of completing the “324C+1D” is not high; The lift Angle of the center of gravity is close to 90°. The vertical height of the center of gravity is significantly higher than the vertical height of the center of gravity when landing, and the vertical moving distance of the center of gravity in the lifting stage is significantly less than the vertical moving distance of the center of gravity in the descending stage. The vertical height of the center of gravity at departure is significantly higher than that at landing. Conclusions In the take-off stage, increase the twisting Angle of shoulders and hips, speed up the swing arm speed and squat speed of the center of gravity in the vertical direction, and shorten the take-off time. Increase the vertical speed of the center of gravity before the patting foot and the vertical moving distance between the center of gravity lifting stage and the descending stage, extend the air time, accelerate the swing speed of the right leg, move the foot patting time forward to the rapid rising stage of the center of gravity lifting, accelerate the rotational angular speed of the shoulder shaft in the air stage and improve the strength of the leg, which is conducive to the athletes to complete the movement.

Prefetch and Push Method of Flight Information Based on Migration Workflow

As the architecture of aircraft cockpit panels becomes more complicated and more flight data are placed onto the panels, trainee pilots require more time during flight training to learn and comprehend flight information. This problem lengthens flight training time and raises costs. This paper proposes a mechanism for prefetching and pushing flight information to facilitate flight training for trainee pilots. This paper addresses the challenges of a high quantity of data and the chaotic time-series relationship between distinct data in flight sequence data by building a migration workflow model in the aircraft cockpit environment and getting flight data with shorter time intervals. Then the flight data are input into the Multilayer Perceptron Long Short-Term Memory (MLP-LSTM) prediction algorithm, which generates the prompt operation information and prediction information by analyzing the current flight data and predicting flight data of next stage. A case study of the takeoff stage is given. The experimental results of the prediction algorithm are given, which prove that the time-series flight data refined by the migration workflow model and MLP-LSTM algorithm have a better prediction effect compared with the LSTM algorithm.

Aerodynamic Stability Study of Turbojet Engine During Unmanned Aerial Vehicle Assisted Taking Off Stage

Rocket Assisted Take Off (RATO) technology is utilized for the takeoff phase of various types of UAVs. RATO creates heavy axial overload for a UAV system, which consequently increases the inlet pressure of the fuel pump of the UAV’s turbojet engine. This situation leads to an abrupt change in fuel supply for its combustor, eventually causing drastic changes in the operating state of the compressor system. In addition, it may potentially induce compressor surge. To resolve this problem, through an experimental investigation, this study delves into the dynamic response of the fuel system during the RATO phase. A two-zone dual-wave coupled compressor model has been established for the intake-turbojet engine system to scrutinize the aerodynamic stability of the turbojet engine during the RATO phase. The findings reveal that when the increase of fuel pump inlet pressure causes changes in the fuel flow rate, it is essential for the engine to re-establish aerodynamic equilibrium in order to mitigate the impacts of abrupt fuel flow step increases. Moreover, it has been observed that the more the ratio of the length of the intake and the cross-section area, the greater the contribution of the inertial force of airflow in the pipe it brings within the passage. This results in a stronger suppression of combustion chamber pressure and flow rate fluctuations induced by fuel step supply, thereby rendering the compressor less susceptible to surge. In summary, this research contributes valuable insights for appropriate matching of intakes, enhancing the ability of the turbojet engine against fuel step supply in the combustion chamber during the takeoff stage and augmenting the aerodynamic and thermodynamic overload resistance capability of the engine.

Transition in the societal value and governance of water resources in Australia and China

The transition of a country or a whole society to sustainability is a long-term goal that involves a society’s willingness to carry out such a change and the governance structure to support it. Understanding the role of the governance structure in enabling or constraining the change dynamics of societal values can more effectively foster desired transitions. This paper aims to reveal the co-evolutionary dynamics in the transition processes of the societal value of water resources and the network configurations of water governance in Australia and China in different socioecological contexts. Newspapers were used to track societal value and structural change in water governance. One mainstream newspaper was selected from each country, spanning a timeframe of 175 years in Australia and 72 years in China. The key finding is that the transition in societal value in both countries followed a similar sigmoid function. The value transition process in both countries benefited from a centralized governance structure, particularly in the take-off stage of the transition.

Pesantren Sosiopreneurs as Community Economic Development (Case Study at Integrated Islamic Boarding School of Al Mumtaz Gunungkidul Yogyakarta)

This research aimed to reveal in detail how the sociopreneur movement of Islamic Boarding School (Pondok Pesantren) Terpadu Al Mumtaz Gunungkidul Yogyakarta was used as a community economic development and to find out what were the strategies of Pesantren Al Mumtaz in driving its sociopreneur existence. This research was qualitative research with a case study approach. Data collection used observation, structured interviews, and documentation, while data analysis techniques used Miles and Huberman's model analysis. The research results showed that Pesantren Al Mumtaz had carried out the four stages of sociopreneurship well, including 1) the pesantren apprenticeship stage. 2) the pesantren launching stages. 3) the pesantren takeoff stage. 4) the pesantren maturity stages. Not only that, but this pesantren also had four strategies to promote its existence in the community, including: 1) collaborating with the local community by holding a Village Culinary Market regularly. 2) recruiting auxiliary staff from the community for various pesantren productions. 3) cooperating with the Regional Government in providing community economic assistance. 4) renting community land to be used as productive land.

All on Board, Take Off! An Example of Practitioner’s Research on Teachers’ Professional Well-being in Higher Education in Their Early Career Stages

Organisations compete on the labour market for highly educated staff and put a lot of effort in attracting new employees. However, high percentages of newly recruited employees leave the organisation within one year. Good onboarding practices and good practices in the stage after onboarding, the take-off stage, could increase retention rates in the early career stages of professionals.In this study an example of practitioner’s research is presented on newly hired teachers’ professional well-being in higher education in their early career stages. Two batches of newly hired teachers at NHL Stenden University of Applied Sciences in the Netherlands were studied in the context of improving HR practices.Research on newly hired teachers revealed the importance of good onboarding practices and the crucial role of team leaders in retaining and motivating newly hired teaching staff.

Assignment and Take-Off Approaches for Large-Scale Autonomous UAV Swarms

In the last decade, the popularity of UAVs has increased tremendously. Nowadays, many researchers are interested in UAV swarms. Coordinating a swarm of UAVs is a complicated task and many problems should be addressed before wide-spread adoption. In this work, we focus on the take-off for large-scale UAV swarms, with an extra focus on the assignment phase. The assignment phase is the first take-off stage whereby we decide which UAV on the ground goes to which place in the air. A good assignment algorithm, is quick, and at the same time reduce the total distance travelled as much as possible. We assess the performance of three different assignment algorithms: a heuristic, the original Kuhn-Munkres algorithm (KMA), and the KMA adapted for GPU use. Each algorithm was tested while varying the number of UAVs, as well as the type of flight formation. During the experiments, we measured the calculation time, total distance travelled, and number of flight paths crossing. In terms of total distance travelled, the KMA always outperforms the heuristic. However, the KMA takes longer (orders of magnitude) to calculate the assignment. Realistically, the KMA algorithm can only be used as long as the swarm does not contain more than 500 UAVs. From that point the GPU version of the KMA is faster. We can conclude that, in most cases, it is recommendable to use the KMA for the assignment as it will reduce the distance travelled to a minimum and, consequently, also reduce the number of flight paths crossing.

ANALISIS KESESUAIAN GERAK TENDANGAN SABIT PADA ATLIT PENCAK SILAT PERGURUAN PERISAI DIRI KECAMATAN WEDUNG

This study aims to determine the development of the athlete's sickle kick in accordance with the mechanical studies needed so that improvements can be made and competitors can perform the sickle kick more realistically and limit injuries. The reason for this research is to examine the biomechanics, and the suitability of the sickle kick movement in martial arts athletes at the Perisai Diri College, Wedung District. The total population in this study were 10 participants in a fighting technique competition from Perisai Diri, Wedung District. This study uses a purposive sample method. The development of the martial arts sickle kick from the tide position stage, take-off stage to the effect stage is the focal point of the article in this review. The retrieval technique used in this research is quantitative explanation. The procedure for collecting information uses documentation techniques. The results of this study indicate that based on a biomechanical analysis of the suitability of the motion of the sickle kick, it is included in the "appropriate" criteria. Based on the results of the biomechanical analysis of the sickle kick and the timing of the sickle kick, this movement is effectively used to carry out attack movements in a martial arts match. The conclusion of this study is that there is a need for improvements in the motion of the sickle kick in the martial arts athlete Perisai Diri, Wedung District based on biomechanics, so that the kick movement can be included in the "very appropriate" category. An increase in the movement speed of the sickle kick is needed to be included in the "very good" category. In addition, increasing the correctness of motion and kick speed is expected to increase the level of suitability of the sickle kick in carrying out attacks during the match.

Does dichotomy between resource dependence and resource abundance matters for resource curse hypothesis? New evidence from quantiles via moments

The aim of this study is to assess the disaggregate effect of natural resources on economic growth in WAIFEM member countries during the period 1990–2020. The study employed the recently developed quantiles regression via moments and documented that resource dependence retarded economic growth of the studied countries in all quantiles. But, the study displayed an insignificant effect of natural resource abundance on economic growth in all the quantiles. However, financial development and institutional quality have been found to have stimulated economic growth in all the quantiles. Therefore, it is important for policy makers in the WAIFEM member countries to advise the government to utilize the rents generated from the natural resources effectively and efficiently in order to develop other sectors necessary for development, just like the policy followed during take-off stage of development as stipulated in economic growth theories. Also, financial development has been found to have stimulated economic growth; the study suggests that governments of WAIFEM member countries should focus on formulating policies capable of providing an enabling environment that allows the private sector to thrive. This can be achieved through the use of rents in the form of capital to support sectoral development with particular attention to the manufacturing sector.

Analysis of volleyball players' force generation during jump spike from the perspective of electromyographic characteristics

Purpose The aim of this study was to investigate the force characteristics of novice athletes and professional athletes in completing a cross spike at position four from the perspective of electromyographic characteristics. Methods Ten novice and ten professional athletes were selected as subjects. The electromyographic characteristics of the athletes were obtained by the Noraxon Ultium electromyography (EMG) and compared. Results In the first stage, i.e., the takeoff stage, the activation level of the rectus abdominis and external abdominal obliques was significantly higher in the professional group (p < 0.05). During the second stage, i.e., the stage of flying to hit the ball, the professional group had a higher integrated electromyography (iEMG) value in the trapezius. Moreover, it showed significantly higher muscle contribution from the rectus abdominis (5.59 ± 1.58%), external abdominal obliques (3.67 ± 1.21%), and trapezius (10.12 ± 2.61%) compared to the novice group (p < 0.05). In the third stage, i.e., the stage of landing and buffering, p < 0.05 in the comparison of the iEMG values of trapezius and gluteus maximus between the two groups. Moreover, the professional group exhibited higher muscle activation levels in all muscles except for the gastrocnemius, compared to the novice group (p < 0.05). Conclusions Professional athletes display superior muscle coordination and more effective muscle force generation in the trunk and lower limbs during the execution of the jump spike action.

OTIMIZAÇÃO DO CURSO DE BASQUETE COM BASE EM CARACTERÍSTICAS MECÂNICAS

ABSTRACT Introduction Currently, college basketball lacks evaluation criteria, making the teaching of many classes reduced to the study of superficial movements, preventing the optimization of the sport’s intrinsic mechanical characteristics. Objective Optimize the methodology of the basketball course by implementing the kinematic analysis of its key movements. Methods Four elite athletes were selected as research subjects. Infrared reflective balls were used as markers on the right elbow joint, right shoulder joint, left hip joint, right knee joint, right ankle joint, and left ankle joint, among other areas. The mechanical characteristics of the possession preparation phase, the ground takeoff phase, the takeoff stage, and the landing phase were compared, classified, and analyzed kinematically by APA software. The data were processed by SPSS software. Experimental data were classified and analyzed using independent variance, considering significant differences for P < 0.05. Results Differences in sports habits, physical conditions, and mechanical characteristics of elite athletes resulted in distinct joint angles, although within a common range. Conclusion When optimizing the basketball course, teachers should fully study the experience of professional athletes and update and optimize the basketball course for students from a more scientific and technical point of view for a better orientation in the sports teaching of the basketball course. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

The Biomechanical Analysis of Jumping Difficulty Movement in National Traditional Sports

In order to explore the relevant factors and the completion of difficult movements, this paper is an important theoretical basis for improving and constructing the evaluation of athletes’ movement quality. It presents a kinematic analysis of the difficult movements of competitive Tai Chi, taking the difficult movements of the swirl group of competitive aerobics as the research object. The data is collected by different methods. When completing difficult movements, due to different personal exercise habits, this paper takes the right leg as the swinging leg and the left leg as the take-off leg when completing the difficult movements. The test object in this paper adopts the traditional three-step up-step method. The starting time of the take-off stage is consistent with the illustration. By consulting experts for the stage division of the difficult movement, the two movement stages are equally divided into three stages according to the needs of the research: take-off, soaring, and landing. The results show that, from the moment the left foot hits the ground to the moment of maximum cushioning, the angles of the right knee are 176.48° and 165.06°, respectively, and the flexion of the right knee is not large; especially when the left foot touches the ground, the right leg is close to a straight line, indicating that the athlete’s body is in a straight line. The posture is relatively good, the left foot is used as the grounding leg, the angle of the knee joint is reduced from 160.82° to 124.41°, and the left knee buffer angle is 36.40°. As the right leg swings to the ground, the left knee and left hip are slightly stretched, and the right knee and right hip are slightly flexed. This change is also reflected in the fact that the center of gravity changes from the direction of the horizontal speed at this stage. Move the left side of the body slightly to the right. Difficulty movements are different in the landing stage, and their joint parameters are also different. When the landing leg touches the ground, there is no significant difference in the maximum cushioning time, the degree of torsion of the shoulder and the hip is different, the relative rotation position of the shoulder and the hip is opposite, and the posture of the shoulders at the time of landing is different. In teaching, the landing leg and the end direction of the rotation are not the same; it is necessary to strengthen the strength training of the legs, to experience the force feeling of the different degrees of rotation of the shoulder joint and the hip joint, as well as the spatial perception ability, and take the initiative to actively land. The magnitude of the rear cushion and the coordination of the trunk and the limbs are used to avoid unnecessary damage during the landing phase.

Biomechanical Analysis of Volleyball Players' Spike Swing Based on Deep Learning.

Deep learning is to learn the inherent laws and representation levels of sample data. The information obtained during these learning processes is of great help in the interpretation of data such as text, images, and sounds. Through the deep learning method, the image features are learned independently, and feature extraction is realized, which greatly simplifies the feature extraction process. It uses deep learning technology to capture the motion of volleyball players and realizes the recognition and classification of motion types in the data. It finds the characteristics and deficiencies of the current volleyball players' spiking skills by comparing the test data of 8 volleyball players' spiking skills and biological analysis. The results show that the front and rear spiking balls with double-arm preswing technology have very obvious technical differences. In the take-off stage, there was no significant difference in the buffering time, the kick-off time, and the take-off time in the front and rear row spikes of the A-type. The buffer time of the B-type spike is 0.26 s in the front row and 0.44 s in the rear row. The range of motion of the front row spike is greater than the range of motion of the back row spike. In the air hitting stage, the range of action of the back row spiking is larger than that of the front row spiking, but the range of action of the back row is greater than that of the front row spiking.

Enhancing the take-off performance of hypersonic vehicles using the improved chimp optimisation algorithm

AbstractThe performance of hypersonic vehicles in the take-off stage considerably influences their capability of accomplishing the flight tasks. This study is aimed at enhancing the take-off performance of a cruise aircraft using the improved chimp optimisation algorithm. The proposed algorithm, which uses the Sobol sequence for initial population generation and a function of the weight factors, can effectively overcome the problems of premature convergence and low accuracy of the original algorithm. In particular, the Sobol sequence aims to obtain a better fitness value in the first iteration, and the weight factor aims to accelerate the convergence speed and avoid the local optimal solution. The take-off mass model of the hypersonic vehicle is constructed considering the flight data obtained using the pseudo-spectral method in the climb phase. Simulations are performed to evaluate the algorithm performance, and the results show that the algorithm can rapidly and stably optimise the benchmark function. Compared to the original algorithm, the proposed algorithm requires 28.89% less optimisation time and yields an optimised take-off mass that is 1.72kg smaller.

Biomechanics of Volleyball Players' Run-Up and Take-Off Link under Deep Learning.

In volleyball, the correct approach and start (including the number of steps and stride speed) are a prerequisite for all technical movements to attack. It can not only improve the horizontal speed of the athlete, but also properly convert the total speed into vertical speed, so that the hitting point is improved and the ball speed is accelerated. To explore the biomechanical characteristics of lower limb movements in the run-up and take-off stage of volleyball spiking, this paper takes four male volleyball players from the Physical Education College of X University as the research objects to analyze the kinematics and dynamics of the run-up process and the take-off process. This paper uses the precise recognition method under the background of deep learning to accurately capture the movements of the research object. This paper discusses the effects of time, speed, distance, knee, and hip parameters (angle, joint muscle torque, and power) on the effect of spiking techniques. It is expected to provide reference for the diagnosis, guidance, and muscle strength training of this special technical movement. The research results show that the horizontal speed of No. 2 athlete is 3.62 m/s and the vertical speed is 2.71 m/s when he takes off. The landing time is 0.375 s and the lift-off time is 0.16 s. The torque and power of the knee joint changed greatly during the take-off process, and the change of the hip joint was small.

Analysis of Biomechanical Parameters of Martial Arts Routine Athletes' Jumping Difficulty Based on Image Recognition.

This paper uses image segmentation technology to examine the biomechanical parameters of martial arts routine athletes' whirlwind legs and backflips, two difficult jumping sports. The successful completion of the whirlwind leg, a typical martial arts jumping difficulty, during the buffer period of the take-off stage, the left knee angle flexion, the drop of the body's center of gravity, and the drop of the horizontal speed of the center of gravity are all significantly correlated, so it is only necessary to grasp airborne altitude and speed from landing. The 720-degree cyclone foot has a flying height of 0.470.11 m, which is 4 cm higher than the 540-degree cyclone foot (0.430.11 m). The antigravity of the last foot is greater than about 1.3 kgf/kg of the left foot during the run-up stage, which allows for a higher rotational angular velocity and completion of the 720-degree difficulty of the whirlwind foot. As a result, it is crucial to pay attention to how you step with your right foot. In the backflip, the coordination of the two legs and the upper body is crucial. The right foot's effective braking can help to increase the body's rising angle. The trunk inclination angle in the flying stage is between 110° and 120°, the knee angle is between 60° and 70°, and the angle between the two legs is between 35° and 35°. When lifting off the ground and landing, the tibialis anterior muscle discharge is greater than the gastrocnemius muscle discharge, which helps to maintain the balance between the fulcrums. As a result, it is necessary to let the non-supporting leg fall first in order to achieve the goal of a smooth landing.

Comparison of Manual Setting Weight Reduction and Topology Optimization of the Wing Tips of Electric Vertical Take-Off and Landing Aircraft

Urban air mobility aircraft are considered an effective solution to traffic jams. These particular aircraft come with different designs and are very different from traditional aircraft. An effective weight reduction method is required to enable ongoing design validation and verification. This paper presents the design of an aircraft with a high space utilization rate of the take-off and landing stage, which allows vertical take-off and landing and has long battery life. For the components fixed at the wing tips and used for installing ducted fans and based on the fused deposition modeling (FDM) process, this paper puts forward two methods to carry out the lightweight design according to the stress conditions of the aircraft, namely, the manual setting the internal structure and the topology optimization. The results show that when the force on the component is small, manual setting is very effective for the purpose of weight reduction, which can also improve the manufacturability of the aircraft.

Wave-to-grid (W2G) control of a wave energy converter

Grid integration of wave energy involves various power train stages from device to grid, such as a power take-off stage, a power conversion stage, and a power conditioning stage. The coupled performance of the complete wave-to-grid system depends heavily on the dynamics of each stage and their respective controllers. However, the control objectives of various stages may not align with each other and pose a potential problem, in terms of economic performance and grid integration. This study presents a complete wave-to-grid control approach for a wave energy converter, ensuring that the system performs optimally under variable wave resource conditions. The proposed system comprises a point absorber wave energy converter oscillating in heave, a linear permanent magnet generator, and back-to-back power converters for connection to the grid. Additionally, short term energy storage, based on an ultra-capacitor, is also added to the DC link between the back-to-back converters for power quality improvement. In the paper, a mathematical model is derived for the individual components of the wave-to-grid system. Then, the controllers for each stage of the power train are designed. A LiTe-Con controller is used for maximum power extraction on the device side, while Lyapunov-based nonlinear controllers are designed for power converter control in order to achieve the full range of control objectives. The result shows that the proposed controllers accomplish the desired control objectives and perform well under various operating conditions.

Improving the efficiency of an aircraft power plant with a turboprop engine based on water-methanol mixture injection

This paper considers a technique for modernizing the power plant (PP) of a regional aircraft. The modernization is based on the injection of water or a water-methanol mixture into the compressor or combustion chamber of a turboprop engine (TPE). An algorithm has been developed for the thermodynamic calculation of TPE parameters, taking into consideration the injected mixture; the mathematical model (MM) has been improved. Methodical studies of the operability and range of application of the improved MM were carried out. The results of mathematical modeling were validated. For verification, the AI-450M turboshaft engine produced by GP Ivchenko-Progress (Ukraine) was used as an object of research. Based on the improved MM, a software module has been developed to study the performance characteristics of a regional aircraft with a TPE. The influence of water injection and a water-methanol mixture on the TPE operating process and the operational characteristics of a regional passenger aircraft has been studied. The proposed measures could be implemented in existing TPEs. This would allow the operation of aircraft without significant modernization of the airport infrastructure. For TPE, the injection of water and a water-methanol mixture is an alternative way of boosting in order to temporarily improve performance. A given modernization technique could improve the TPE power up to ~10 %, as well as reduce the amount of harmful emissions. The results obtained showed a satisfactory convergence of estimated and experimental data. The error of the results under the accepted assumptions does not exceed 3 %. The calculation results demonstrate the advantages of injection at the take-off stage of the aircraft to reduce the take-off distance (up to 45 % in hot conditions TAMB=+30 °C) and reduce the time of climbing the echelon (~10 %)