Specific Work Research Articles

Scheme design and assessment of hybrid pump feed system with energy management for throttleable liquid rocket engine

Currently, there is considerable emphasis on the electric pump-fed cycle for liquid engine, primarily due to its design simplicity. However, its development is hindered by the underdeveloped state of power battery technology. Drawing inspiration from hybrid power technology used in electric vehicles and turbochargers, a hybrid pump feed system for throttleable engines is originally proposed as a promising solution. This system integrates the electric motor into the gas generator cycle, with several topologies evaluated. The parallel configuration featuring a mid-motor is selected for its compact structure, efficient power-splitting and energy recovery. Additionally, customized energy management strategies and optimization models are developed to effectively allocate power throughout the operational processes of liquid engines. A comparative analysis of four engine cycles is conducted under the typically variable-thrust mission. The results indicate that attributed to the conservation of turbo-gas and battery energy, the optimized hybrid pump achieves a reduction of 2.39 % compared to the turbopump and 7.15% to the electric pump in total mass. Adaptability assessment further indicates that the mass advantage of the hybrid pump system is more significant during prolonged engine burning and deep throttling. Specific working conditions are found in which the system prefers electric-motor driving or regenerating turbine energy. Although energy-recovery results in the system efficiency decrease, it serves to lower energy demand of battery pack, thus easing the burden on cell thermal management and structural design. This study provides a practical design framework for hybrid pump-fed rocket engines in future variable-thrust missions.

Analisis Yuridis terhadap Perjanjian Kerja Waktu Tertentu (PKWT) dalam Hubungan Kerja (Studi Kasus pada PT. Gratia Jaya Farma)

The demographic bonus period in Indonesia has an impact on the availability of workers of productive age for companies. The weak position of workers in employment relations means that many workers do not get their rights as they should. In this case, the working relationship between PT. Gratia Jaya Farma and its employees who use a Specific Time Work Agreement (PKWT) should be based on the laws governing employment in Indonesia. Thus, this research aims to explain more specifically the contractual relationship in the implementation of a Specific Time Work Agreement (PKWT) at PT. Gratia Jaya Farma from a positive legal perspective. The type of research used is sociological juridical with qualitative analysis techniques. This research was carried out at PT. Gratia Jaya Farma, with data sources in the form of interviews with relevant informants and secondary data in the form of literature reviews, journals and other documents. The results of the research show that the implementation of the Specific Time Work Agreement (PKWT) at PT. Gratia Jaya Farma is largely in line with Government Regulation Number 35 of 2021 and other provisions. Things that are implemented include the terms and conditions for the validity of the work agreement, the nature and type of work, the rights and obligations of the parties and so on. Meanwhile, provisions that have not been implemented and inhibiting factors must be evaluated in order to create a good working relationship.

The main ways to improve the effectiveness of electronic document management protection

Information resources and information systems are among the main protected elements in all spheres of life of modern enterprises [11-15]. Today, the means of negative information impact on these elements are actively developing, the counteraction of which requires extensive diverse research and development of relevant concepts, programs for organizing specific work in the field of creating tools, methods and techniques for ensuring information security. Illegal distribution of digital documents by authorized but unscrupulous users is a growing threat to the confidentiality of organizations, which a document management system using only encryption methods cannot fully cope with. This problem occurs together with access to a digital document by unauthorized users. In this article, as a countermeasure to protect digital documents from these two threats, a new approach is proposed that carefully combines encryption and fingerprinting methods at certain stages of the digital document lifecycle. Within this scenario, a full analysis was carried out, in which the main constituent elements, their interaction, data flow and the provision of security services were identified. This protection system guarantees a sufficient level of security, since it uses standard cryptographic algorithms and recommended key sizes. The purpose of this approach is to provide information security services such as confidentiality, integrity, authentication, non-repudiation and user tracking, thereby protecting digital documents throughout their entire life cycle.

Simulation Research and Practical Application of Cutting Teeth for Drill Bits in Life-Support Holes

This study aims to achieve rapid drilling of life-support holes, regarding the optimization design of drill bits as the key, among which the simulation analysis of drill bit cutting teeth is an important technical means. Firstly, based on the rock mechanics test results in the study area combined with the corresponding logging information, the analysis and evaluation of the geological conditions in the study area were completed, a complete rock mechanics characteristic profile was established, and the drillability of the rock was calculated to be relatively good. Then, a numerical simulation of parallel cutting of rock with conical teeth was established by experimentally testing rock mechanics parameters and using the discrete element method (PFC2D). The simulation study of the drill bit cutting teeth was completed by parameter calibration, analysis of rock cutting morphology, analysis of the number of rock cutting cracks, and analysis of the specific work of rock cutting and breaking. It was determined that the optimal rock-entering angle of the drill bit cutting teeth in the Shouyang mining area is 14°. Finally, verified by field practice, the optimized drill bit has stable performance, strong cutting ability, and good wear resistance; the maximum instantaneous mechanical drilling speed reaches 58.14 m/h, and it shows a slightly worn state after continuously drilling 582 m in the stratum, meeting the requirements of one-trip drilling and hole formation for life-support holes. This research provides a scientific basis and practical techniques for the construction of life-support holes in the Shouyang mining area and under similar geological conditions. It can provide more effective emergency plans and rescue strategies for possible mine disasters in the future, which is crucial for improving the technical system of emergency rescue for mine accidents and enhancing the emergency rescue capability of surface drilling.

Design and Performance Analysis of a Tea Impurity Eliminator

The present tea production technology is extensive and unsanitary as tea processing has the issues of easily mixing in hair, animal hair, and other debris problems. The production enterprises can only use a large number of workers to manually sort the tea, requiring large labor for low efficient and unideal sorting results. Hence, tea production enterprises urgently need to solve this problem to meet the product to meet the quality requirements of health food. In this paper, the design and development of the vibration motor of the key components in the tea impurity removal unit were studied. The specific work is as follows. The dynamic analysis of the movement of the material on the vibrating working surface is performed, the motion state of the tea declutter vibration machine is determined as throwing motion, and the structure scheme of the elastic link eccentric type vibration machine is designed. The structure scheme of the elastic link eccentric vibration motor was modeled by Inventor 3D design software, and the suitable parameters were selected for trial production of a prototype.

Implications of Storing Original Diplomas on The Security of Employee Documents in A Fixed – Time Work Agreement

The company maintains original diplomas to prevent employees from leaving their jobs before completing their employment contracts and to build employee loyalty. The formulation of the research problem is, 1. What is the validity of keeping original diplomas by the company for employees in a Specific Time Work Agreement (PKWT)? 2. What are the implications of storing original diplomas for the security of employee documents in a Specific Time Work Agreement (PKWT)? The research method used is the normative legal research method. The research results show that storing original diplomas is said to be legal because the Employment Law does not explicitly regulate the prohibition on storing original diplomas or other documents belonging to employees, but an agreement arises in Article 1320 of the Civil Code in the form of a Specific Time Work Agreement (PKWT). between the company and employees. Storing original diplomas by the company for employees has implications for the security risks of the employee's documents, if the original diploma is lost, damaged or affected by a disaster, there will be no replacement or duplicate for the diploma in question.

Unemployment insurance for the self-employed: A conceptual way forward

In this contribution we give common guidelines on how unemployment schemes for the self-employed could be developed in practice. These guidelines have been derived from national descriptions contained in this special edition on unemployment protection for the self-employed, or in other recent comparative contributions on the matter. Our reference framework is the EU Council Recommendation (2019) on Access to Social Protection, and more in particular the overall objective that social protection should be designed in a labour status neutral manner and, where necessary, adapted to the specific work situation of the professional groups covered. Applied to unemployment, the design of the scheme should be as similar as possible to that of unemployment insurance for wage earners. However, it is crucial to adapt the rules as specifically as necessary to the nature of self-employed work, such as, for example, the fact that the self-employed do not work for an employer. Starting from this basis, we developed key rules with regard to unemployment schemes for the self-employed. We did so by addressing the essential components of unemployment schemes: the definition of the unemployment risk, financing, access and entitlement conditions, and re-eligibility in case of repeated claims for unemployment benefits. We also address recent evolutions in the labour market, such as coverage when multiple activities are performed (combining activities as an employee and as a self-employed person), and elaborate on situations involving temporary closure of the self-employed activity (e.g. due to Covid-19) and partial unemployment. In conclusion, we provide some reflections on the apparent ongoing evolution of the risk of unemployment towards a broader income protection scheme, which not only provides income replacement in case of a final loss of professional activity or self-employed business, but also gives structural income support if the person loses income partially due to external economic and/or social reasons.

Thyroid Screening Techniques via Bioelectromagnetic Sensing: Imaging Models and Analytical and Computational Methods.

The thyroid gland, which is sensitive to electromagnetic radiation, plays a crucial role in the regulation of the hormonal levels of the human body. Biosensors, on the other hand, are essential to access information and derive metrics about the condition of the thyroid by means of of non-invasive techniques. This paper provides a systematic overview of the recent literature on bioelectromagnetic models and methods designed specifically for the study of the thyroid. The survey, which was conducted within the scope of the radiation transmitter-thyroid model-sensor system, is centered around the following three primary axes: the bands of the frequency spectrum taken into account, the design of the model, and the methodology and/or algorithm. Our review highlights the areas of specialization and underscores the limitations of each model, including its time, memory, and resource requirements, as well as its performance. In this manner, this specific work may offer guidance throughout the selection process of a bioelectromagnetic model of the thyroid, as well as a technique for its analysis based on the available resources and the specific parameters of the electromagnetic problem under consideration.

드라마 등장인물에 대한 개인 평가어 연구: 체계기능언어학의 평가어 이론의 관점

Objectives The purpose of this paper is to analyze Appraisal, one of the theories of discourse meaning analysis in Systemic Functional Linguistics(SFL), in relation to the Appraisal patterns of specific individuals. In SFL, this is called Signature. Methods Therefore, this paper focuses on the Signature of 11 characters in the entire script of episode 1 in <What is Love?>. The specific work was conducted in two stages. First, lexical evaluators (I), which examines the types and frequency of Affect, Judgment, Appreciation, and Graduation; and second, grammatical evaluators (II), which examines the number of sentences, types of Mood, types of addressee deference and Engagement words. Results To summarize the results of the above two steps, (A) Need-dissatisfaction type Sim-ae is overwhelmingly frequent in Affect, Judgement, Appreciation, Graduation, and Engagement. She expresses all kinds of lexical evaluatives in a bold way. (B) Repressed and perverse type Sun-ja uses about half as many evaluatives as Sim-ae, but with very different ups and downs. Affect, which express how she feels, and Graduation, which control the intensity of her speech, are high, but Judgement, which evaluates the actions of others, and Appreciation, which express social respect or social approval of a given situation, are low. (C) Paternalistic and assertive Isa-jang is good at utilizing Judgement and Graduation, and is relatively low in Affect and Appreciation. (D) indecisive Park-isa rarely uses Jedgement. He uses the other evaluative words, Affect, Appreciation, Graduation, moderately frequently and appropriately. (E) Women are more likely than men to use Engagement for both setting(‘case-open’) and settled(‘case-closed’). Conclusions The study of Appraisal has a wide range of applications and is a highly scalable area of research. It is expected that the study of Signature can also find some generalizable patterns of Appraisal system if the analysis target is broader.

The functional state of the body in workers engaged in mining in the Arctic zone

Introduction. The functional state and adaptive potential in workers employed at mining enterprises in the Arctic territories are influenced both harmful environmental factors and specific climatic conditions, age and work experience in contact with harmful working conditions. Assessing the impact of work experience on the health in employees to reduce occupational risks and prospects for preserving and strengthening the health of workers at mining enterprises remains an extremely relevant and timely task. Materials and methods. A cross-sectional study of workers was based on a mining and processing plant for the extraction of loparite ore in the Murmansk region. Two hundred one male employee participated in the study. Cardiohemodynamic and somatometric indices were evaluated, on the basis of which integrative indices for assessing functional changes were calculated. The subjects were ranked into groups by work time and age. Results. The analysis of somatometric indicеs, depending on work experience, revealed significant intergroup differences in body mass index, index of physical changes, blood pressure and heart rate. The analysis of heart rate variability showed that with an increase in work experience, there is a unidirectional, negative change in time indices and the wave structure of the heart rhythm towards suppressing the activity of the autonomous regulation circuit with an increased contribution of sympathetic influences on the heart rate. Limitations. Difficult access to medical information and employees’ fears of participating in the study due to fear of dismissal for health reasons. Conclusion. With an increase in work experience, negative changes in the functional state of the body of mining workers in the Arctic zone of the Russian Federation are comprehensively manifested (overweight, an increase in the index of functional changes, an increase in blood pressure). The increased influence of sympathetic influences on the heart rhythm, with the suppression of self-regulation processes, is reflected in the tension of regulatory mechanisms leading to a decrease in adaptive potential and the development of a premorbid state.

Efficient multi-objective optimization and operational analysis of amine scrubbing CO2 capture process with artificial neural network

Amine scrubbing processes for post-combustion CO2 capture have been extensively studied and significantly improved via various novel designs. However, the amine scrubbers implemented nowadays were usually not optimized according to a number of different evaluation criteria. This is often due to the fact that, for high dimensional design spaces, the rigorous simulation runs needed to facilitate process optimization always calls for huge numbers of simulation software accesses and overwhelming iterative calculations. Therefore, in this study, the well-trained surrogate model was adopted to replace its rigorous counterpart for the purpose of ensuring efficient optimization runs in practical applications. In current study, two objectives, i.e., the specific equivalent work and the CO2 capture level, were both rapidly and effectively optimized in various practical scenarios with different flue gas CO2 concentrations. The corresponding operational parameters and utility consumptions were also easily obtained without additional effort. The computation results obtained so far showed that the proposed surrogate-assisted approach can be utilized to significantly reduce the computational load in practice.

MECHANISMFOR ATTRACTING STUDENTS RSPU IM. A.I. HERZEN TO SCIENTIFIC WORK

The article presents the results of a pilot sociological study on the topic: “Why should students of a pedagogical university engage in science.” The object of the study were students of the Russian State Pedagogical University named after A.I. Herzen, and the subject: the process of involving them in the work of student scientific associations. The purpose of the study is to describe the mechanism for involving students in extracurricular scientific work. We examined the problem of the existence of two types of such mechanisms: 1) one that serves to attract all University students in educational and entertaining pseudo-scientific detail and 2) aimed at involving gifted students in specific scientific work. Work on the topic was carried out using a combination of methods. The first group of methods: participant observation, formalized, structured sample survey with self-completion of a questionnaire, etc., and the second is a modeling method, including the construction of models, their verification by comparing the model with the characteristics of the original. The result of the work carried out was the substantiation of the idea put forward by us that the model of the mechanism for involving students of a pedagogical university in educational and entertaining pseudo-scientific activities differs from the model of involvement in scientific work itself; the experience of the mechanism for involving students in specific scientific work was generalized (scientific research of departments, unique research developments by small student teams, on a topic proposed by a teacher seriously involved in science, etc.); it was found that such work is not effective without the political will of the University leadership, acting in accordance with the content of the classical model of education and social challenge.

Stimulating Preschoolers' Creative Imagination through Hands-on Practice Activities

The research aims to develop the creative imagination of pre-school children, using different working techniques in practical activities. An experimental, formative methodology was developed. Twenty-nine preschool children of the "Nicolae Iorga" Secondary School, Bacău, in the 5-6 years age group, namely Group B "Sunbeam", participated in the research. To stimulate creative imagination, specific working techniques for practice, and hands-on activities were systematically used, and modern strategies based on diverse techniques and materials were introduced into the children's work. The research results revealed that hands-on practice activities allow for the selection of activity organization forms that foster learning through discovery. This type of learning, while requiring independent effort, motivates participation and stimulates the creativity of pre-schoolers. This is because they are engaged in developing their knowledge. A creative motivation for knowledge and self-discovery has been observed in preschoolers, which supports the acquisition and development of personality traits specific to creative people: self-confidence, independent thinking, and sensitivity to problems.

Developing a systems-focused tool for modeling lung cancer screening resource needs

BackgroundEarly detection through screening dramatically improves lung cancer survival rates, including among war Veterans, who are at heightened risk. The effectiveness of low dose computed tomography scans in lung cancer screening (LCS) prompted the Veteran’s Affairs Lung Precision Oncology Program (VA LPOP) to increase screening rates. We aimed to develop an adaptive population health tool to determine adequate resource allocation for the program, with a specific focus on primary care providers, nurse navigators, and radiologists.MethodsWe developed a tool using C + + that uses inputs that represents the process of the VA LCS program in Ann Arbor, Michigan to calculate FTEs of human resource needs to screen a given population. Further, we performed a sensitivity analysis to understand how resource needs are impacted by changes in population, screening eligibility, and time allocated for the nurse navigators’ tasks.ResultsUsing estimates from the VA LCS Program as demonstrative inputs, we determined that the greatest number of full-time equivalents required were for radiologists, followed by nurse navigators and then primary care providers, for a target population of 75,000. An increase in the population resulted in a linear increase of resource needs, with radiologists experiencing the greatest rate of increase, followed by nurse navigators and primary care providers. These resource requirements changed with primary care providers, nurse navigators and radiologists demonstrating the greatest increase when 1–20, 20–40 and > 40% of Veterans accepted to be screened respectively. Finally, when increasing the time allocated to check eligibility by the nurse navigator from zero to three minutes, there was a linear increase in the full-time equivalents required for the nurse navigator.ConclusionVariation of resource utilization demonstrated by our user facing tool emphasizes the importance of tailored strategies to accommodate specific population demographics and downstream work. We will continue to refine this tool by incorporating additional variability in system parameters, resource requirements following an abnormal test result, and resource distribution over time to reach steady state. While our tool is designed for a specific program in one center, it has wider applicability to other cancer screening programs.

Transcritical CO2 mixture power for nuclear plant application: Concept and thermodynamic optimization

The conventional steam power cycle suffers from lower thermal efficiency, larger size, and inadequate cold source matching, failing to meet the demands for high efficiency, compactness, and adaptability required by new-generation underwater power plants. Consequently, the T-CO2 mixture power cycle has been proposed for technological innovation in underwater nuclear plants. Thermodynamic model of the recuperated, precompression, recompression and partial cooling cycles is developed based on the first law of thermodynamics. And the thermodynamic performance of five CO2 mixtures, including CO2/SO2, CO2/H2S, CO2/butane, CO2/propane, and CO2/cyclohexane in the four cycles coupled with a pressurized water reactor (PWR) and an advanced high-temperature reactor (AHTR) is investigated. The findings reveal that when optimized for thermal efficiency, the CO2/cyclohexane is better suited for recuperated and precompression cycles, while CO2/H2S and CO2/propane are more suitable for recompression and partial cooling cycle. Furthermore, regarding the T-CO2 mixture power cycle incorporating PWR and AHTR, the recompression cycle of CO2/propane and CO2/H2S should be opted to achieve maximum thermal efficiencies of 33.07 % and 46.07 %, respectively. Conversely, selecting the precompression cycle of CO2/H2S can yield maximum specific work of 98.61 kJ/kg and 161.62 kJ/kg, respectively. Therefore, investing in reforming nuclear power with new technologies is a feasible policy choice. Additionally, policymakers need to closely monitor the reform requirements of nuclear power plants.

An Integrated Solution in Utilizing Active Magnetic Ranging to Seal Off Underground Gas Storage: Theoretical Analysis and Field Test

Summary In this paper, we describe a comprehensive technology based on an active magnetic ranging system (AMR) for sealing off the cement plug (CP) in the open hole (OH) section of the wellbore below the existing CP for underground gas storage. Utilizing depleted oil and gas reservoirs for natural gas storage is an important approach toward achieving carbon neutrality. Sealing off old wellbores is prioritized according to relevant standards. The challenge with OHs with CP is that there are no magnetic beacons in the wellbore, and the extent of compaction is unknown. Accurate placement of the seal-off CP is crucial because current technical methods, such as electromagnetic and acoustic waves, have limitations. Magnetic ranging technology, which is mature and widely used for wellbore interceptions or collision avoidance, requires magnetic beacons such as steel casing, drillpipes, or bottomhole assemblies left in the borehole. On the other hand, acoustic positioning techniques are applicable but presently complex to run operationally. In this paper, we propose a comprehensive control technology. It starts by measuring the positional relationship between the subject wellbore (SW) and a magnetic beacon wellbore (MBW) using AMR. The data are then used in combination with additional skew data along with associate positional uncertainty or ellipse of uncertainty (EOU) to determine the location of the target wellbore (TW) and the MBW. By calculating the relative positional relationship between the SW and the TW, OH reentry below CP can be achieved within the EOU below the sidetracking point. After reentry, specific work such as crushing, element logging, caliper logging, and full hydrocarbon gas detection is performed to verify if the TW is still in the original position and if the caprock is properly squeezed and sealed off. The comprehensive technique or method was tested on five wells in the Bohai Bay, successfully assessing the position of the OH wellbore and reentering below the CP. The process system expands the field of AMR and demonstrates significant industrial application value. It provides a new means of sealing off complex old wells.

Development of a coupled process - design numerical model for an automotive assembly

Abstract The product development process is a very challenging one, especially in the case of the automotive industry. The actual constructions require performance and quality while focusing on mechanical performance, lightweight and cost-effective. Thus, the virtual development stage is critical. Once the product is validated according to its geometrical definition and features, it is necessary to evaluate its mechanical performance. This process is usually performed using numerical simulation methods. In this paper, the numerical process performed for the validation of a safety part is discussed. As a specific feature, the assembly is finished using a riveting process. The manufacturing process’s influence on the assembly’s mechanical performance is further investigated. A discussion of the methods available for the design validation summarizes the finding of this specific work.

Travel counsellors’ perspectives on AI assistance

Research on AI in the context of travel counselling has mainly focused on increasing the efficiency and level of automation of online travel bookings. However, AI solutions can also be used in the context of offline travel counselling, i.e., face-to-face counselling at a travel agency service desk. In this specific application domain, AI has the potential to change personal interaction between counsellors and clients in different ways. In order to design AI solutions to enrich personal interaction, research on the specific requirements of counsellors, customers, and other relevant stakeholders in the context of AI-assisted offline travel counselling is needed. Human-centered design (HCD) is a promising approach to investigate and incorporate these perspectives on the course of the AI design process. In this paper, we present our approach of applying HCD elements to deepen the understanding of the context of use, to specify user requirements, and to find potential design solutions for a real-world use case of AI assistance in offline travel counselling. In addition, we highlight the key findings and insights regarding travel counsellors’ perspectives and requirements on possible AI adoption, showing that they are primarily open to AI-based innovations, but also have some concerns about the devaluation of the counselling profession. Further, we critically discuss additional design elements that would be needed for human-centered AI design in an ambitious sense.Practical Relevance: The findings are of high practical relevance as they demonstrate how HCD principles can be applied to real-life use cases, which aim to introduce human-AI interaction in work domains. At the same time, our findings provide valuable insights for practitioners into the specific work environment of offline travel counsellors.

Causes and Countermeasure of Job Burnout of Funeral Workers from the Perspective of Public Management in Anhui Province, China

Background and Aim: The purposes of this study were 1) to study the causes of job burnout of funeral workers from the perspective of public management in Anhui Province.2) to study the countermeasures of job burnout of funeral workers from the perspective of public management in Anhui Province and 3) to study the recommendations of job burnout of funeral workers from the perspective of public management in Anhui Province. In this study, semi-structured in-depth interviews were conducted with 8 funeral practitioners from 4 funeral institutions in Anhui province (taking 4 funeral institutions in Hefei, Anhui Province as examples). Materials and Methods: Through interviews with key informants who represented a range of roles within the funeral industry and a focus on four funeral agencies, the study carefully investigated the funeral industry in Anhui Province. Eight people—funeral directors, cremators, embalming surgeons, funeral attendants, and people who handle remains—provided insights between 2023 and 2023, offering a thorough picture of the dynamics and practices of the industry in the area. Results: (1) The causes of job burnout of funeral workers from the perspective of public management in Anhui Province on the whole are under great pressure. The social prejudice against the funeral profession and the oppressive working environment. (2) In terms of personal characteristics, funeral workers have significant differences in their work stress responses due to differences in gender, age, working hours, and specific work content; In terms of education level, marital status, and position, there is no significant difference in work stress response of funeral workers. (3) From the analysis of various dimensions of work stress sources for funeral workers, the five dimensions of workload, colleague relationship, work environment, family relationship, and social 2influence have significant predictive effects on the overall work stress response. Conclusion: Funeral workers in Anhui Province experience severe job burnout as a result of social prejudice, oppressive working conditions, and a variety of personal issues. Workload, colleague relationships, the work environment, family dynamics, and social influence all have a significant impact on work stress, and reactions vary by gender, age, and job type.

Synergy performance of hybrid fiber-reinforced ultra-high-performance cementitious composites with low fiber contents

This study aims to assess the synergistic tensile performance resulting from the hybridization of long and short fibers. Three types of long steel,fibers, i.e., twisted, hooked, and smooth fibers, along with two types of short fibers, i.e., smooth and polyamide fibers, were incorporated into ultra-high-performance concrete (UHPC) at a total volume content of 1.5%. To predict the tensile resistance of the hybridizations, various machine learning models, including artificial neural network (ANN), decision tree (DT), random forest (RF), and support vector machine (SVM), were applied by utilizing a significant number of collected experimental results. Experimental findings demonstrated that the hybridization of long and short fibers effectively enhanced tensile resistance compared to mono fibers. These hybridizations exhibited negative synergy factors in post-cracking strength but positive synergy factors in both strain capacity and specific work to fracture. Predictions using machine learning models revealed that the RF model exhibited outstanding performance in predicting the tensile resistance of the hybridizations. Furthermore, the compressive strength of the matrix was found to be the most important factor affecting post-cracking strength, whereas fiber length had the most substantial impact on the strain capacity.