bluuebunny/crossref_metadata_2025 huggingface dataset:
THE TACTICAL AND PSYCHOLOGICAL INFLUENCE OF THE INVESTIGATOR (DETECTIVE) ON PERSONS PARTICIPATING IN CRIMINAL PROCEEDINGS
Authors: KOPANCHUK Volodymyr , KRAVCHUK Oleg , NOVAK Oleksandr , TUROVETS Yurii
Published: October 2024

The authors of the article outline the legal foundations and prospects for the development of criminology, forensic psychology and criminal procedural law in the light of legal reform in Ukraine. The peculiarities of the tactical and psychological influence of the investigator (detective) on persons participating in criminal proceedings are considered. The author’s own (author’s) methodology for solving a number of problematic situations that may arise in the practical activities of a law enforcement officer of Ukraine is presented for consideration and discussion. The need for effective cooperation of law enforcement officers, specialists in the field of criminology and forensic psychology in order to qualitatively and objectively perform the tasks of criminal proceedings, comply with the general principles of the criminal process and improve the innovative policy of Ukraine in general is substantiated. The authors defined and provided their own list of legal positions and techniques for possible opposition to procedural and legal techniques and tricks of the subject. A methodological basis for determining the elements of lies, slander, hearsay and suggestion during the interrogation of a witness or suspect is provided. The significance and evaluation of these short stories in the system of law, criminology, forensic psychology and the criminal process as a whole is revealed. Conclusions were made and recommendations were given regarding the coordinated application of the norms of the current legislation in the practical activities of the investigator, detective and criminalist. Attention was drawn to the need for further scientific cooperation of scientists, specialists in the field of material and procedural law.
FEATURES OF EXAMINATION OF A CORPSE DURING THE INVESTIGATION OF MALICIOUS FAILURE TO FULFILL DUTIES OF CARE FOR A CHILD OR A PERSON UNDER GUARDIANSHIP OR CARE ESTABLISHED
Authors: KRYVOPUSK Oleksandr , OLEYNIK (KHLYNTSEVA) Olga
Published: October 2024

The article is devoted to the study of the tactical features of conducting an examination of a corpse during a pre-trial investigation of malicious failure to fulfill the duties of caring for a child or a person for whom guardianship or custody has been established. The authors have considered in detail and specified the goals and objectives of the investigative (search) action in the context of the investigation of malicious failure to fulfill the duties of caring for a child or a person in respect of whom custody or guardianship has been established. The issue of the interaction of the investigator and other participants in the examination, in particular the forensic medical expert, was revealed. The work reasonably emphasizes the need to involve specialists from various fields of knowledge to conduct an examination of a corpse during the investigation of crimes provided for in Art. 166 of the Criminal Code of Ukraine. The article offers an authors’ approach to the preparatory stage of conducting the indicated investigative (search) action. On the basis of the analysis of the materials of the criminal proceedings, the places of examination of the corpse, inherent in the investigation of the crime provided for by Art. 166 of the Criminal Code of Ukraine. In addition, the article provides a list of technical means used in the course of an investigative (search) action, features of detection, fixation and removal of traces, which individually or in their entirety may indicate the commission of a malicious failure to fulfill the duties of caring for a child or a person in respect of whom guardianship or care has been established. During the research, the author used dialectical, formal-logical, systemic-structural methods.
MEDIA BETWEEN STATE, LAW AND SOCIETY DURING INTERNATIONAL ARMED CONFLICTS. PART ONE: WORLD WAR I, THE ENTENTE
Authors: SAMOTUHA Andriy , FURFARO Ricardo
Published: October 2024

This article starts a cycle of publications highlighting problems of constitutional restriction of the right to information, countering enemy propaganda and promoting one’s own ideologues and narratives as elements of counter-propaganda. After all, the current information wars, as components of hybrid ones, are characterized by a battle not so much of facts, but of senses and narratives, which are almost not refuted by the opposing parties, and therefore, fall less and less under legal regulation, and more under political conjunctures. Considerable attention has been paid to the issue of media censorship during the war. The time limits of setting the scientific problem cover the period from the First World War as the first international armed conflict in terms of the number of participating states to the present day – the Russian-Ukrainian war as the forerunner of a new confrontation between authoritarian regimes and the democratic world. On the example of the Entente countries (Great Britain, France, the Russian Empire) and its associated state-participant – the USA, the authors have concluded, that in the absence of then international legal restrictions on the subjective right to information even after the end of the Second World War, initiated the further and increasing participation of state and non-state actors in the implementation of information policy as in the interwar periods in the form of hybrid wars, as well as open armed confrontations in the context of all stages of the information revolution.
SOCIAL PROTECTION AND SOCIAL SECURITY OF POLICE OFFICERS
Authors: NAHORNA Olena , LAHUN Karyna
Published: October 2024

The article examines the social protection and social security of police officers who perform the dangerous and important work of ensuring public safety. The authors examine various aspects of the social protection of police officers, focusing on their rights, benefits and guarantees provided to ensure their welfare and safety. The article analyzes the social protection system for police officers, including support in case of injuries and disabilities, health insurance, pension system and other social benefits. The authors also explore the challenges faced by police officers in the field of welfare, such as insufficient financial support, inadequate medical care and the use of the right to strike. Attention is also drawn to the need to improve the social protection system of police officers, including increased funding, improved working conditions and provision of adequate medical care. The authors propose solutions that can improve the social protection of police officers, in particular by developing special programs and policies that take into account their needs and characteristics. The general conclusion of the article is that social protection and social security of police officers are critically important aspects of their professional activity. The authors call for improvements to the welfare system to ensure proper working conditions and safety for police officers who give their lives to protect the community.
Assessment and Monitoring of the Security of Information Resources
as an Emergency Situation
Authors: Komarov Valery , Buinevich Mikhail
Published: October 2024

Formulation of the problem: control (evaluation) and monitoring of the information protection system (IPS) effectiveness are an integral part of the protected information objects operation process (state information systems, information systems of personal data, significant objects of critical information infrastructure). Imperfection of the control and monitoring means of the IPS together with her the vulnerabilities often leads to computer incidents with protected informatization object subsequent failure and/or degradation of its. One of the effective ways to solve this problem is the organization and implementation of preventive measures.
The purpose of the work is reducing the response time and elimination of consequences from a computer incident caused by IPS measures to control (evaluate) the effectiveness.
An additional goal is to neutralize information security threats implemented by an external intruder using sociotechnical methods (fishing).
Methods: generalization and analysis of the existing regulatory and methodological support for the actions of information security units to carry out control (evaluation) measures, as well as in case of emergency situations and the occurrence of computer incidents.
Novelty: the novelty elements is consideration of the event on ISP effectiveness control (evaluation) as a non-emergency situation in the informatization object operation under protect.
Result: the necessity of introducing a threat to information security new class – the threat of information resource performance disruption caused by IPS control (assessment) and monitoring of the effectiveness are proved.
Practical significance: the results of the work can be used to ensure organizations information resources security when the Center for Information Protection and Special Communication FSS of and territorial security bodies in relation to them measures to assess their security and the ability of bodies (organizations) to resist threats to information security.
Using Problem-Based Learning to Boost Social Studies Performance: Classroom Action Research in Grade 5 at SD INPRES 3 Talise
Authors: Santika  , Zulnuraini  , Firmansyah Arif , Muchdar
Published: October 2024

The role of education in developing effective problem solvers, critical thinkers, and responsible members of society is of great importance. This research deals with the low performance in social studies subjects caused by the continued application of conventional teaching models. The aim of this study is to improve the learning outcomes of grade V students in social studies subjects at SD INPRES 3 Talise by applying the Problem-Based Learning (PBL) model. This classroom action research was conducted in two cycles, following the Kemmis and McTaggart model, involving 22 students from grade V. Data were collected through tests, observations, and interviews, then analysed quantitatively and qualitatively. Initial observations revealed that only 36.36% of students achieved the learning objectives with an average score of 50.90. The implementation of PBL involved the collaborative planning, action, observation, and reflection phases. The results demonstrated significant improvements in student engagement and learning outcomes. The average score increased, and the percentage of students who achieved the learning objectives rose significantly, respectively from 63.63 in cycle I to 81.59 in cycle II. However, the average score did not yet reach the KKM. Furthermore, the percentage of completeness has also increased, namely in cycle I by 59.09% and cycle II by 86.36%. This research demonstrates that PBL can effectively enhance the quality of social studies education by fostering learning.
Development of Comic Media to Improve Problem Solving Abilities and Interest in Learning Mathematics Subjects of Elementary School
Authors: Firmansyah Firmansyah , Irnandi Irfan , Siregar Nahrun Najib , Simamora Ebeneser Wacner , Indriyani
Published: October 2024

This research aims to develop Class IV Mathematics Comic Media with Fraction Material that is valid, practical and effective to improve elementary school students' problem solving abilities and interest in learning mathematics subjects. This research method is development research or Research and Development (R & D). The procedure used is to simplify the Borg & Gall development model (in Sugiyono, 2015: 298-331) which consists of 10 steps, in this research it will be limited to the seventh step. The population in this study is the population in this study are students at SD Negeri 02 Amban. The research sample chosen was class IV students for the 2023/2024 academic year. The sample in this study was divided into two, namely class IV A students as the experimental class and class IV B students as the control class. Data collection techniques used in this research include questionnaires, interviews, validator assessment sheets, and problem solving ability tests. The data analysis techniques used in this research consist of three, namely validity, practicality and effectiveness data analysis. The research instruments consisting of learning implementation plans, student worksheets, comic media, problem solving ability tests, and learning interest questionnaires that have been developed are in the very good category based on the assessments of the three validators. Practicality obtained a positive response from students of 88.6%, which is in the very practical category. Students' problem solving abilities are better than the problem solving abilities of Control class students. The average problem solving ability of Control Class students is 60.31, while the average problem solving ability of experimental class students is 72.50. There is an influence of interest in learning on students' problem solving abilities.
Implementation of the Pancasila Student Profile Strengthening Project in Developing Creativity of Elementary School Students
Authors: Nunung Purwanti  , Fitri Indriani
Published: October 2024

Creativity is a new idea or imagination in creating something. This creativity is a person's ability to create new things that are developed from existing ideas or ideas that arise from their own minds. Creativity must be developed from an early age, especially during school so that there is always a renewal that is created. Increasing this creativity can be done in strengthening the values of Pancasila and entrepreneurship projects. This study examines the role of the Pancasila Student Profile Strengthening Project in fostering creativity among elementary school students through entrepreneurship initiatives. Conducted at SD Muhammadiyah Noyokerten, students engaged in various activities such as plasticine making, waste management, and healthy sandwich preparation, integrating practical skills with conceptual learning. This holistic approach aims to empower students to be creative, innovative, and environmentally conscious, contributing positively to their communities. The learning method used is descriptive qualitative which describes projects using a variety of materials and techniques to support practical and conceptual learning. The activities cover a range of topics, including flour plasticine making, plastic waste management, healthy sandwich making, and fruit ice and fruit satay making. Through these activities, students are not only introduced to practical skills, but also encouraged to understand important issues such as environmental sustainability and healthy eating. The overall conclusion is that this learning empowers students to become creative, innovative and environmentally conscious individuals, with a positive impact on their daily lives and the community around them.
The Impact of KOSICA Media (Light Properties Box) on the Learning Interest of Grade IV Students in Light Properties Materials
Authors: Maimunah Khairun Nisa , Abdullah Kusmajid
Published: October 2024

The low interest in learning science on the properties of light is the background for this research due to the use of less relevant learning media. This research aims to find out how fourth grade students' interest in learning about the properties of light is influenced by KOSICA media. This research uses an experimental approach in quantitative research with a nonequivalent control design. The sample used was 64 class IV students. Data collection techniques include a learning interest questionnaire and a KOSICA media questionnaire. Obtaining final score research data shows that the experimental group got a score of 70.44 and the control group got a score of 63.13. It can be seen that the final score of the experimental group was 70.44 > 63.13 greater than the control group. Because KOSICA media can make learning more meaningful and enjoyable, make students more active in learning and can arouse students' interest in learning, it has been proven that the use of this media can influence the enthusiasm of fourth grade students in studying the properties of light.
Hypothetical Learning Trajectory Strategy in Ethno-Realistic Mathematics Education: An Exploration of Damar Kurung
Authors: Wiryanto  , Habibie Ramadhan Kurnia , Nurlaily Vivi Astuti
Published: October 2024

This study investigates the use of Damar Kurung Gresik, a traditional Indonesian art form, to enhance mathematics education for 4th-grade students through the Hypothetical Learning Trajectory strategy within Ethno-Realistic Mathematics Education. The aim is to integrate local cultural elements into the curriculum to foster better student engagement and understanding through contextual learning. Employing a Design Research methodology, the study was conducted with 32 elementary students. Data collection methods included classroom observations, interviews with teachers and students, and document analysis. The Hypothetical Learning Trajectory framework was applied to teach geometry, measurement, and pattern recognition, using Damar Kurung as a pedagogical tool to connect mathematical concepts with the art-making process. Findings indicate that the familiar context of Damar Kurung significantly increased student interest and motivation. Moreover, students exhibited improved comprehension and application of mathematical concepts, demonstrating considerable progress along the learning trajectory. Teachers reported that the structured approach provided by the Hypothetical Learning Trajectory facilitated more effective lesson planning and delivery, leading to enhanced learning outcomes. The study concludes that incorporating Damar Kurung into mathematics education through the Hypothetical Learning Trajectory strategy within the Ethno-Realistic Mathematics Education framework holds substantial promise for improving the quality of learning and mathematical understanding among 4th-grade students. This approach not only enriches the educational experience by making it more relevant to students' cultural backgrounds but also supports the development of critical thinking and problem-solving skills in mathematics.
Strategy for Instilling Trustworthy Character Using the Tumpe Method in Elementary School Students
Authors: Lamadang Karmila , Mamat Supriatna  , Sapriya  , Nana Supriatna  , Falimu
Published: October 2024

The tumpe-based character education method is a strategy that is expected to be effective in instilling values ​​and character education in elementary school students. This approach is implemented at SDN Negeri 1 Toili, Banggai Regency with a focus on cultivating the character of Trustworthiness (Integrity). The Tumpe method is a participatory and experiential learning approach that involves students in the entire process. The aim of this research is to find out what the trustworthy character education strategy is using the Tumpe method at Toili 1 Elementary School, Banggai Regency. This research method is a qualitative descriptive method, namely a method that relies on observation, interviews and documentation. The research results show that the strategy of instilling character in school-age students is very important to become their educational capital in the future. The TUMPE method is an educational method that is easy to apply.
Keywords: Strategy, Trustworthy Character, Method, Tumpe
Frequency Ratio Effects on Dynamic Behavior of Rotor-Bearing System
Authors: Zaghlol M.G. , Sayed Hussein , El-Sayed T.A.
Published: October 2024

This research introduces a non-linear dynamical model containing Jeffcott rotor with flexible properties and an unbalanced rotating disc. The rotor is supported on two short journal bearings. The disk is surrounded with an elastic snubber ring with significant radial clearance between the disc and the snubber ring. This work considers the dynamic interaction between the rotor disc and the much stiffer snubber ring (stator) using a four degree-of-freedom model to account for inherent nonlinearities. The bearing forces are evaluated by solving Reynolds equation considering short bearing approximation. The system equations of motion are solved numerically by direct integration using the state-space technique. The nonlinear dynamic response results due to the changes in the frequency ratio arising from rotor disk–snubber ring (stator) interactions are evaluated. The present work results show that the system’s response is highly dependent on the frequency ratio, which is defined as η = Ω/ω (forced frequency/natural frequency. Rich dynamics are recorded ranges from periodic, quasi periodic and chaotic.
Mechanical Analysis on the Frame of JC-17B Mobile Lifting Jack
Authors: Zhang Shiqiang , Chen Qian , Zhang Zhixia , Meng Kuan
Published: October 2024

Mobile lifting jack is one of the key equipment necessary for the maintenance base of EMU. At present, manual mobile lifting jack is the most widely used. The mobile lifting jack is mainly composed of frame, transmission device, bracket part, base and other parts. The frame is the main bearing part, and its safety and stability have an important impact on the normal use of the whole mobile lifting jack. In this paper, Pro/E, ANSYS and other modern engineering software platform are used to analyze the stress, strain and buckling mode on the frame of JC-17B mobile lifting jack. The results show that the maximum equivalent stress of the frame 3000mm away from the rail surface is 107.927MPa, which meets the strength requirements. The first and second order vibration frequencies of the frame are low, close to the frequency of the vibration source, and there is a danger of resonance, so try to avoid it. The research results provide a reliable theoretical basis for the development, technical transformation and equipment update of various types of frame in the future.
Structural Design of a Duck Bill Transplant Machine
Authors: He Qin , Hong Yan
Published: October 2024

In view of the current transplanting technology in China was still in the state of manual operation, not only the labor intensity of workers was high, but also the transplanting efficiency was low. This paper proposed a duck mouth transplanting machine with fast transplanting speed and high survival rate. Through the structural design of the transplanting, transmission device and soil covering mechanism of the transplanting, different transplanting requirements were met as far as possible. The advantage of this design was that by setting the open and close drive assembly, controlling the device to open the seedling at the lowest position, so that it could ensure the seedling upright when transplanting, so as to play a good role in supporting the seedlings. So that the seedling damage probability is relatively low; and the duck mouth device for a single plant operation, there is no replanting, leakage phenomenon, thus the work efficiency can be improved.
Nonlinear Dynamic Behavior and Vibration Mechanism of a Large Range Rotating Elastic Beam Under Parallel Misalignment Constraints
Authors: Zhao Lei , Xu Meiye , Zhai Ran , Jiao Likuan
Published: October 2024

Large rotating flexible machines are prone to vibration at high speeds, which is a difficult engineering problem. In this study, we have deeply explored its nonlinear dynamic behavior and vibration mechanism, especially considering the effect of parallel misalignment. Through mathematical modeling and MATLAB simulations, we found that the rotational speed and the amount of misalignment are the key parameters affecting the stability of the system. The results show that the rotational speed and parallel misalignment are the sensitive parameters of the system. When the amount of misalignment is 0.002 mm, with the increase of rotational speed, the elastic beam exhibits nonlinear M-type vibration, doubly periodic and chaotic behaviors, which show high-frequency abrupt excitation; when the angular speed is 50 rad/s, with the increase of the amount of misalignment from 0.001 mm to 0.1 mm, the system exhibits the transformation of doubly periodic, chaotic and proposed periodic motions, and the characteristics of intermittent vibration are significant. These results provide an important theoretical basis for suppressing its nonlinear vibration.
Development of a Hydraulic Press for Composite Material Fabrication
Authors: Choong Wai Heng , Baharudin Muhammad Fadzlih , Yoong Hou Pin , Chua Bih Lii , Mohd Shah Mohd Kamal
Published: October 2024

This paper presents the development of a hydraulic press machine for composite material fabrication, specifically aimed at educational purposes. Although various hydraulic press machines are available, this development addresses specific needs and financial limitations. The project adhered to defined design requirements, evaluated through finite element analysis (FEA) and further refined into a physical prototype. An on-scale 3-dimensional virtual model modeled for FEA purposes. The analysis revealed that the machine structure deforms by 0.57 mm along the vertical axis under a maximum compression load of a 2-ton hydraulic jack, which is insignificant influenced the fabricated composite panel thickness uniformity. A physical prototype was constructed based on the blueprint drawing, and a series of trial composite material panel fabrications were conducted for improvement purposes. Through a series of fine-tuning adjustments, the resulting panels achieved overall maximum thickness deviation of 3.81%, meeting the ASTM D7136 tolerance for drop-weight impact resistance testing.
Camphor-Based Closed-Cell Aluminium Foam Prepared by Powder Metallurgy Technique
Authors: Prasad Devendra , Bharti Ajaya , Kumar Naveen
Published: October 2024

Metallic foams have attracted attention of all the industries because of their high strength to weight ratio and long life. Particularly, aluminium foams have approximately uniform pores in the structure which is responsible for their higher mechanical properties in comparison to the conventional structure. In the present work, the aluminium foams were developed by powder metallurgy technique using the camphor as a space holding and Al6061 powder as a matrix, mixed using a ball milling machine at 200 RPM for 30 minutes, compacted using a universal testing machine at 450 MPa pressure and sintered in a muffle furnace at 500°C for one hour, the camphor burns out and aluminium foam developed. With an increase in the volume fraction of camphor by volume up to 50%, porosity increases, compressive strength decreases by almost 66%, compressive strain increases by almost 100%, and the highest strain energy is absorbed by 30% camphor-based aluminium foam.
Application of a Modified Hyperbolic Sine Law for Modeling Minimum Creep Rate of 2.25Cr-1.6W
Authors: Feng Shenhao , Lu Joan , Xu Qiang
Published: October 2024

The creep damage and the need of modelling minimum creep rate is introduced, and recent research activities reviewed. To improve the accuracy and simplify the prediction of minimum creep rate, a modified hyperbolic sine law was chosen to model the minimum creep rate of 2.25Cr-1.6W with temperature from 773K to 923K and stress from 60MPa to 360MPa. The modified hyperbolic sine law was designed and used by this research group before with success. Here, the models for minimum creep strain rate were developed at constant temperature and/or multi-temperature. Very good accuracy was achieved for constant temperature cases, and compatible accuracy with existing literature was achieved for multi-temperature case studies. Furthermore, the model for constant temperature one was incorporated with Monkman-Grant approach for creep lifetime modelling, and very good accuracy was achieved. This paper, thus, contributes to the develop of methodology for accurately predicting minimum creep rate and lifetime, and the specific knowledge for the investigated low Cr steels. Concluded the future work would be exploring the potential of extrapolation by removing the lowest few stress loadings’ data points when optimizing constants.
Study on Dynamic Characteristics of Offshore Gangway Devices with Series Configuration
Authors: Li Chenxu , Sun Wanqi , Chen Haiquan , Wang Shenghai
Published: October 2024

When a ship is sailing at sea, it will be disturbed by loads such as wind, waves, and surges, resulting in six degrees of freedom oscillation motion, which poses a serious threat to the safe transfer of personnel and cargo. The offshore gangway, as an efficient and safe means of sea transfer, has received widespread attention both domestically and internationally. In this context, in order to achieve the expected design requirements of the offshore gangway device, it is necessary to carry out relevant simulation analysis. In this paper, firstly, the study explored the kinematic and dynamic simulation methods based on a certain type of offshore bridge installation, as well as the derivation of theoretical formulas, secondly, a detailed introduction was given to the dynamic simulation process and boundary condition settings of a certain type of offshore bridge installation based on ADAMS, at last, ADAMS software is used to carry out dynamic modeling and numerical simulation analysis, simulate the kinematic and dynamic parameters of the core components, obtain the kinematic and dynamic characteristic curves of each key component, verify the feasibility and rationality of the design, and provide reference and theoretical basis for the design, experiment, and improvement of the offshore gangway device.
Experimental Study on Shear Strength of Polyurethane-Reinforced Sandy Soil
Authors: Lai Jie , Liu Yun , Liu Yuan
Published: October 2024

Polyurethane curing agent, as a common soil reinforcement material, has strong durability, natural degradation, and ecological and environmental protection characteristics. In order to achieve the effect of the solidification agent on strengthening sandy soil, a relevant mechanical test was conducted in this paper. Research has shown that polyurethane curing agent can control the relative movement of sand particles caused by external forces effectively, and enhance the cohesive ability between sand particles, which has a good reinforcement effect on the sandy soil; As the content of curing agent gradually increases, the internal friction angle and cohesion of sand gradually increase; When the content of curing agent exceeds 17.5%, its cohesion shows a decreasing trend. When the content of curing agent is 15% and the fiber content is 0.5%∼1.5%, the shear resistance of the sandy soil can be best improved. The research content of this paper really plays an important role in promoting the popularization and application of polyurethane-reinforced sandy soil.
Analysis and Research of Shallow Buried Bias Single-Lane Tunnel Based on CAE Simulation
Authors: Wu Yuehan , Deng Long , Gu Feng , Liu Zhiyong
Published: October 2024

Single lane tunnel is a common engineering type in water conservancy and highway, and shallow buried biased pressure tunnel is the most obvious problem in tunnel tunneling stage, which is a major problem in tunnel excavation construction. Due to shallow soil cover and partial pressure, slope instability is easy to occur, which is unfavorable to tunnel structure and surrounding rock. The lateral pressure coefficient of the surrounding rock outside the tunnel is affected by the calculated friction Angle of the surrounding rock, the friction Angle on both sides of the middle rock pillar and the bias slope Angle, and the lateral pressure coefficient of the inner surrounding rock of the double tunnel is also affected by the buried depth and the net distance of the tunnel. The vertical pressure distribution of tunnel vault is affected by tunnel depth, bias Angle and lateral pressure coefficient, but it is most affected by tunnel depth. The horizontal pressure of the surrounding rock of the tunnel is affected by the lateral pressure coefficient of the tunnel and the buried depth of the tunnel, but the buried depth of the tunnel plays a major role. The greater the buried depth, the greater the horizontal pressure of the tunnel. How to ensure tunnel quality and avoid safety accidents has become an important research topic. With the development of engineering technology, more and more computer-aided tools are applied to the solution analysis of complex engineering. Based on CAE simulation analysis method, this paper carries out slope stability checking calculation, structure and surrounding rock pressure analysis of BIM model of shallow buried biased single-lane tunnel, and summarizes a structural design method suitable for this type of tunnel.
Study on the Effect of Fin Position on Heat Dissipation Effect of Finned Heat Sinks
Authors: Chen Cuiyi , Huang Zhiwei , Li Minjun
Published: October 2024

Finned heat sinks are reliable and are used in a large number of applications to aid in the dissipation of heat from electronic heat-generating devices. Designing heat sinks with high heat dissipation efficiency under limited installation conditions and working environments is the challenge of the day. The positional parameters such as different depths of fins inserted into the heat sink base, number of fins, different angles of inclination of fins, different widths and rows between fins, and different staggered heights of fins are analyzed for heat dissipation based on the finite element analysis method. It was found that the higher the number of fins, the better the heat dissipation effect under the same conditions. The deeper the fins are inserted into the radiator base, the better the heat dissipation. Changes in the angle of the radiator fins do not have a significant effect on heat dissipation. Heat dissipation cannot be improved by reducing fin width and increasing fin spacing. The staggered fin height does not have a significant effect on heat dissipation. The results of the study show that increasing the number of fins and the depth of fins inserted into the radiator base improves heat dissipation when designing the fin locations of finned radiators.
Core Loss Estimation for Three Phase Transformer Based on GPR and FEA
Authors: Kul Seda , Aslan Muhammet Fatih , Tezcan Suleyman Sungur
Published: October 2024

This study used the Gaussian Process Regression (GPR) method to predict the core losses of the Finite Element Analysis (FEA) based dry-type three-phase transformer. In the estimation and analysis processes, the core area Ac, primary excitation voltage Vp and the primary winding number of turns Np are used as three input parameters. GPR is a powerful machine learning method for such low-featured data and provides a Bayesian-based regression capable of measuring uncertainty in predictions. The data generated in the ANSYS/MAXWELL environment for core loss estimation is chosen at random using the parametric FEA setup. The Matern 5/2 kernel function is used to train these data using GPR. Thus, the results are pretty satisfactory; Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and Mean Squared Error (MSE) performance metric values are calculated as 0.0102, 0.0029, and 0.0534, respectively. Also, the estimated results are very close to the simulation value. As a result, the GPR method can be used as a reliable tool for estimating core losses with high accuracy during the transformer design stage.
Research on Autonomous On-Line Technology of Regenerator Robot
Authors: Fu Bo , Lin Minhong , Yang Dawei
Published: October 2024

This study examines an autonomous up-line technology solution that can be applied to a repowering robot. The solution involves the construction of a track for the robot to climb using insulated ropes mounted on insulated poles, which are fixed on top of the overhead conductor of a 10kV distribution line. Subsequently, a climbing online mechanism along the insulating tape is designed and applied to the repowering robot itself, thereby enabling the robot to autonomously and smoothly ascend to the overhead conductor. Subsequently, the structure of the online mechanism and the motor selection are studied in order to optimise the design of the device that can autonomously operate on the 10kV distribution line. Finally, the research and design of the structure of the hanging wire frame and its matching tooling are carried out with the objective of achieving convenience in the hanging of the wire and providing a more reliable, efficient and safe way of up-linking.
Tracking a 3D Robot for Inspection Weld
Authors: Duong Vu
Published: October 2024

Today, the detection of defects by non-destructive testing (NDT) is more often applied in shipyards, marine construction, refineries, storage petroleum systems, etc. But at this stage, inspection quality is mainly executed manually. That is a very dangerous and expensive one. Therefore, the study and engineering of robots for defect detection had significant and practical meaning in Vietnam. The robot can be adhesive to the surface and move accordingly along the seam line as a 3D mapping route. This requirement can be resolved if the robot is moving steadily and can follow exactly the tracking. The tracking ability of the robot can be achieved by the identification image processing algorithm. This paper focuses on the design and testing of a robot that can move along the metal surface freely and automatically against 3D welding seams in real time, in interaction with the operator, and mark defects. The results of the study and prototype meet desirable expectations.
Design PID Controller Utilizing the Root Locus Technique for Inspiratory Cycle Volume Control Mode of Two Double-Acting Piston Pump Ventilator
Authors: Phan Trung Dat , Truong Cong Toai , Duong Van Tu , Nguyen Huy Hung , Nguyen Tan Tien
Published: October 2024

In epochs of significant fluctuations in human health, medical equipment has garnered unprecedented attention, with mechanical ventilators being a focal point of numerous studies. Previous research has typically focused on controlling two critical parameters: volume and pressure. In actuality, the mechanical ventilator’s controller must continuously monitor and address the intricate dynamics of the respiratory, which comprises airflow, pressure, and volume, to operate the two double-acting piston pumps in real time to meet the patients experiencing disease. To surmount this obstacle, this paper puts forward designing a PID controller based on a root locus to modulate the output airflow and ensure the tidal volume remains within a 15% error margin of the actual value. Specifically, simulations were conducted with the parameters of a 70-kilogram male patient in scenarios such as normal lungs, COPD, and ARDS. From there, the result of these scenarios are solid evidence to demonstrate that the airflow follows the square wave signal accurately, and the relative error of the tidal volume is maintained within a 5% error margin. Moreover, this approach markedly improves the transient response and steady-state error of the output airflow compared to the initial system.
Research and Design of High-Efficiency Stripping Mechanism of Regenerator Robot
Authors: Yang Dawei , Fu Bo , Chu Runtian
Published: October 2024

The aim of this study is to examine the potential of repowering robots in the maintenance of distribution networks. In particular, it considers the use of such robots for insulation stripping operations, and their capacity to meet the rigorous standards of conductor integrity. Firstly, an in-depth analysis is presented concerning the core operational principle of the stripping mechanism. Additionally, an innovative design of a high-efficiency insulation layer stripping mechanism, which integrates advanced optical vision sensing technology, is developed. Subsequently, the feasibility of the aforementioned mechanism was corroborated through a series of empirical experiments, wherein the issues and potential for optimization in actual operational conditions were duly analyzed. Based on the results of the experimental analysis, the stripping mechanism was subjected to iterative optimisation, leading to the development of an efficient stripping mechanism for repowering robots. The proposed mechanism can ensure the safe maintenance of power lines while significantly enhancing the efficiency and quality of maintenance operations.
Finite Element Analysis of Passive Chip Heat Sinks
Authors: Wang Haiting , Huang Zhiwei , Xu Wen
Published: October 2024

The chip power is increased due to the increase in computational processing. The increase in chip power leads to serious chip heating, so the requirements for chip heat sink cooling efficiency increase. In this paper, a passive chip heat sink is designed taking into account the requirements of chip heat dissipation and integrated structure. Factors affecting the heat dissipation of passive chip heat sinks are investigated using finite element analysis. To study the influence law of passive chip heat sink geometry, metal material, and chip power on the heat dissipation effect. A pin-straight ribbed heat sink was designed to dissipate heat better than the original pin and straight ribbed heat sinks with the same parameters. Under the same parameters, the difference in the thermal efficiency of copper heat sinks compared to aluminum heat sinks is relatively small, and aluminum can be chosen as the heat sink when considering the cost of materials. The use of steel material as a heat sink is an option in case of low power of heat source chips. The results of the study can provide help in designing passive chip heat sinks.
On a General Method for Modeling the Controlled Dynamics of Manipulators with Parallel Kinematics as Systems with Geometrical Constraints
Authors: Krasinskiy Aleksandr Ya
Published: October 2024

An adequate mathematical model including all components of an automatic system is a prerequisite for the most cost-effective implementation of the device’s potential capabilities. Such a strict nonlinear mathematical model must make it possibility to minimize the actuator drives number, reduce the measurement information amount (the number of measuring sensors) and analyze transient processes in actuator drives. The traditional application of Lagrange equations with constraint multipliers in dynamics models of non-free systems leads to an increase in their dimensionality. The variables of such models are all coordinates, all (including dependent) velocities and also constraint multipliers. The article develops the application of the theoretical mechanics rigorous methods non-free systems to minimize the dimensionality of nonlinear mathematical models of parallel manipulators as the systems with geometric constraints, taking into account the dynamics of actuator electric drives. The transition to equations in redundant coordinates, free from constraint multipliers, excludes from consideration not only multipliers, but also dependent velocities. The application of the proposed approach to modeling the stand Ball and Beam dynamics is considered.
Design of Intake Tower Structure Based on Elastic Stress Diagram Method
Authors: Huang Yi , Lu Diqiu , Xu Dabin , Du Guilin
Published: October 2024

In the building of hydro-power station, the inlet tower structure of the spillway tunnel is an important building to ensure the realization of the flood discharge function of the hydro-power station. The tower inlet is a tower-shaped junction against the bank slope. The shaft type water inlet is a gate arranged in the shaft, which is generally suitable for the part of the bank slope is slow and the inlet section has good conditions for forming holes. In this project, the slope of the water inlet is steep and the topographic elevation is low. If the shaft intake is used, there is no condition for the layout of the shaft, and the position of the shaft is close to the left dam abutment, which conflicts with the layout of the dam, so the inlet type is chosen as the tower type. In order to study the rationality and seismic resistance of the design of the intake tower of a hydro-power station preferably, the numerical simulation of the intake tower is carried out based on the finite element analysis method. At the same time, the vertical stress and maximum principal stress of the typical position of the intake tower under two working conditions are given. The calculation results show that the stability of the intake tower is good and the design of the intake tower is reasonable, which provides a scientific basis for the design and construction of the intake water tower and similar research.
Research on Wind Resistance of Large-Span Cable-Stayed Bridges with Shaped Towers
Authors: Liu Chengzhe , Lin Congxin , Han Mingyu , Li Jichao , Qiu Yunjun , Fan Qiang , Zhang Pengjv
Published: October 2024

The main span of Shenzhen Chishi River Bridge is a 256m single-tower double cable-stayed steel box girder cable-stayed bridge. Considering the regional culture, livelihood characteristics, architectural landscape and other factors of the Shenzhen-Shantou area, the overall curve of the cable-stayed tower adopts the “carp” shape similar to the curvature of a fish’s belly, and the cross-section adopts the arched “dragon gate”-shaped cross-section. The heteromorphic tower shape is unique, and the cross-section construction and stress are more complex; based on local customs and folklore, to put forward the design concept of “Fish Leap Dragon Gate” there are few cases in the country. Firstly, the design key technology of the bridge tower is introduced. The simulation analysis of the load-bearing capacity of the tower is carried out. Then, the tower’s static and dynamic wind resistance is investigated through the finite element analysis and the wind tunnel test of the tower’s self-supporting state air-elastic model. The results show that the tower does not have considerable vortex resonance and chirp vibration under crosswind, and the amplitude of shaking vibration is small, which has good wind resistance performance and can provide a reference for the design of similar bridges and towers.
Analysis and Optimization of Carbon Dioxide Liquefaction Process in Songnan Gas Field
Authors: Yu Haiyang , Huang Qiyu , Liu Huan
Published: October 2024

Under the background of carbon peak and carbon neutrality in China, oil and gas enterprises are responsible for the effective recycling of high-concentration carbon dioxide emission sources. Since the carbon dioxide liquefaction and recovery unit of Songnan Gas Field was put into operation in 2011, it has not reached the design capacity, and the stable production capacity can only reach 30% of the design capacity due to unstable compressor operation, low liquefaction pressure, insufficient cold supply and other reasons. In order to improve the recovery and utilization rate of carbon dioxide resource, Aspen HYSYS software was used to simulate and optimize the carbon dioxide liquefaction recovery process. After process optimization, the actual liquefaction production capacity was increased by 81%, and the carbon dioxide resource in Songnan Gas Field was fully recycled. The research results can provide the optimization direction and theoretical basis for the further optimization and upgrading of carbon dioxide liquefaction and recovery unit.