bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Striker Design on the Absorbed Energy of Low-Energy Reference Specimens Used for the Indirect Verification of Charpy Impact Testers
Authors: Schuurmans Johan 
Published: January 2023

Abstract
Attempts to optimize the design of instrumented strikers for accurate dynamic force measurement were successful for a Toni MFL 300J Charpy impact tester (C-type hammer). However, the instrumented strikers for a Tinius Olsen IT406 machine (U-type hammer) failed to meet the indirect verification requirements at the low-energy level specified in ASTM E23-18, Standard Test Method for Notched Bar Impact Testing of Metallic Materials. To investigate whether the design of the striker contributes to the absorbed energy of low-energy reference specimens, the Charpy impact test was simulated for different striker designs by using finite element analysis. This exercise confirmed a contribution to the absorbed energy, attributed to the elastic energy stored in the striker at the point of brittle fracture (striker energy). The striker energy is proportional to the striker compliance, which is much larger for strikers for U-type machines than for C-type machines. Consequently, the absorbed energy of low-energy reference materials tested on C-hammer machines will be lower than when tested on U-hammer machines. The possibility of correcting the absorbed energy by subtracting the striker energy was investigated. For this purpose, historical records of instrumented tests on low-energy reference materials performed on pendulum impact testers with different strikers were analyzed. Correcting the absorbed energy shifts the striker bias. With no correction, more than half of the indirect verifications at the low-energy level failed, whereas nearly all passed after correction. Although a bias remained for individual strikers, the averaged corrected bias of all strikers was close to zero, indicating that the proposed method of correcting the absorbed energy of low-energy reference materials for the striker energy can potentially cancel out the striker influence, thereby yielding a striker/machine-independent value for low-energy reference materials.
The Use of Thermal Imaging in Free Perforator Flap Planning
Authors: Čepas Adas , Fomkinas Mantas , Gindriūnas Simas , Budreckis Kasparas , Pilipaitytė Loreta , Rainys Domantas 
Published: January 2023

Background. Preoperative planning and design of microsurgical perforator flaps are the main steps for successful operation. The aim of this study was to determine the concordance between thermographic images obtained with smartphone thermal imaging camera and hand-held Doppler in the anterolateral thigh flap (ALT) model. Methods. A concordance study of diagnostic tests was carried out in Hospital of Lithuanian University of Health Sciences Kaunas Clinics, Plastic and Reconstructive Surgery Department during 2020–2022. Patients’ who were scheduled to undergo reconstruction with ALT flap and healthy volunteers were included in the study. Dynamic thermal images were performed with smartphone thermal camera FLIR One PRO in the typical ALT flap territory. The number and distance of hotspots in the thermogram with respect to anterior superior iliac spine were recorded in the study protocol. Later, the examination was repeated with hand-held Doppler and the control of hotspot was performed. Sensitivity, specificity and concordance index calculations were performed. Statistical analysis was performed using IMB SPSS 23.0. Results. A total of 100 ALT flap territories were examined. 266 hotspots were detected with thermal imaging and 275 perforators with hand-held Doppler. In 96.6% of cases, hotspots detected by a thermal camera were confirmed by hand-held Doppler as perforators. The sensitivity and specificity of thermography for the detection of perforators with respect to the hand-held Doppler were 93.5% and 96.9% respectively. The measure of concordance kappa index was 0.095 (p = 0.001). Conclusion. Smartphone thermal imaging have a high concordance with hand-held Doppler in perforator mapping, thus could be considered a useful adjunct to conventional methods.
Psychedelic integration challenges: Participant experiences after a psilocybin truffle retreat in the Netherlands
Authors: Lutkajtis Anna , Evans Jules 
Published: January 2023

AbstractThis article reports on integration challenges that were experienced by nine individuals who attended a three-day legal psilocybin truffle retreat in the Netherlands. The study employed a qualitative phenomenological approach, using semi-structured interviews to gain an understanding of participants' (n = 30) psilocybin experiences and their after-effects. While the study did not actively seek to measure integration issues or unexpected side effects, nine out of thirty participants (30%) spontaneously reported a post-experience integration challenge. These challenges included: mood fluctuations, ‘post-ecstatic blues’, disconnection from community, re-experiencing symptoms, spiritual bypass and perceived lack of support. Integration challenges were transient; they occurred immediately after the psilocybin experience (once the main psychedelic effects had worn off) and in the days and weeks following the retreat, and resolved with time. Integration challenges were also correlated with positive after-effects including long-term remission of significant health conditions. The experiences related in this article align with existing literature that describes the ‘spiritual emergency’ phenomenon; that is, the potential challenges that can arise after ecstatic experiences and how these challenges may be integral to the transformative potential of such experiences. We discuss the implications for psychedelic integration and harm reduction practices and for future psychedelic research.
Recruitment discrimination of lifetime classic psychedelic users is unjustified: Evidence from employees' motivation-based workplace absenteeism
Authors: Korman Benjamin A. 
Published: January 2023

AbstractBackground and aimsAlthough large-scale population studies have linked the use of classic psychedelics (lysergic acid diethylamide, psilocybin, or mescaline) to reduced odds of physical health problems, mental health problems, and criminal behavior, the roughly 35 million adults in the United States who have used classic psychedelics are nonetheless stigmatized in the American job market. Various federal organizations in the United States automatically reject applicants on the sole basis of prior psychedelic use, thereby practicing an open form of legal discrimination against these applicants. The present study investigates whether this discrimination can be justified based on associations between lifetime classic psychedelic use and motivationally-based workplace absenteeism.MethodsUsing pooled cross-sectional data from the National Survey on Drug Use and Health (2013–2019) on 193,320 employed adults in the United States, this study tests whether lifetime classic psychedelic use predicts the number of workdays employees skipped in the last month (i.e., motivationally-based workplace absenteeism).ResultsAfter adjusting for sociodemographics, physical health indicators, and other substance use, no significant association between lifetime classic psychedelic use and motivationally-based workplace absenteeism is found.ConclusionThis study builds on classic psychedelic research that is just beginning to take work-specific outcomes into account and offers empirical justification for the elimination of arbitrary drug-based recruitment policies in the workplace.
Development of a method to harvest mechanical energy to use as an alternative to electrical energy in electric powered rides
Authors: Megalingam Rajesh Kannan , Sasikumar Bharath , Raghavan Dhananjay , Raagul Vadivel Shree Rajesh , Makkal Mohandas Sreekanth , Kuttankulangara Manoharan Sakthiprasad 
Published: January 2023

Mechanical energy harvesting, storage and utilization methods and devices are a little explored area with a potential to replace electrical energy in machines operated with electricity and which is environmentally friendly. Energy harvesting from human actions is an optimistic solution to provide energy supply. There are various methods and techniques that discuss energy harvesting from human actions. The problem is that most of these methods deal with tiny energy output. The object of this study is to design and characterize a flat spiral spring based method to harvest enough mechanical energy, to store and to drive a ride as in an amusement park instead of electricity. A flat spiral spring is specifically designed and fabricated for this purpose. To begin with, a life-size prototype of the kids' ride using the flat spiral spring is modeled, analyzed, fabricated and implemented on the kids' ride prototype. The stability of the ride is analyzed by modeling the impact of the collision between two kids' rides. Energy is harvested by winding the spring by hands using a handle or by pulling back the kids’ ride and is stored in the spring. Experimental results show that the proposed method of harvesting, storing and utilization of mechanical energy can be an alternative to electrical energy in operating high-power machines like kids' rides. An optimum width of 30 mm and a thickness of 1.4 mm for the flat spiral spring are found to help in ease of manufacturability, ease of rotation by human and compactness. The average force required to wind the spring is calculated to be 16.06 N, which is approximately 33 % of the force that can be exerted by a human hand. The stability of the proposed system in case of collision is verified by calculating the roll angle, which is less than 3.83 degrees, which is well below the recommended roll angle limit in case of collision.
Determining optimal rated power of a photovoltaic station for mine dewatering
Authors: Vasylets Sviatoslav , Vasylets Kateryna 
Published: January 2023

The object of the study is the main dewatering system of the mine. Climate change has stimulated the refusal to use coal in many countries. In conditions of massive closure of mines, there is a need to pump out mine waters to avoid flooding. A significant water influx determines the high cost of electricity consumed by pumps. It is proposed to increase the efficiency of the mine dewatering system due to the introduction of a smart power supply grid with photovoltaic generation. The relative value of the annual balance of payment for energy consumption is chosen as an optimization parameter. The rated capacity of the photovoltaic station is optimized according to the criterion of approaching, with accuracy up to the permissible mismatch, the absolute value of the optimization parameter to zero. The relationship between the optimization parameter and the rated capacity of the photovoltaic station is represented by a parabolic regression. Regression parameters are estimated in the case study for a specific mine based on the results of a single-factor simulation experiment conducted using a computer model of a smart power grid. The randomness of natural, technical and economic factors is taken into account. Based on the prediction intervals for the regression, the optimal rated capacity of the photovoltaic station for the selected mine is estimated at 3.164 MW with a pump capacity of 1.732 MW. It was found that the annual energy savings for the case study conditions reach 3,745 MWh. Equipping the power supply grid of the main dewatering system with a photoelectric station of optimal configuration will reduce the cost of consumed electricity to several percent. This will make it possible to avoid financial costs for maintaining the balance of underground water and reduce the flooding probability of coal regions being transformed
Increasing energy efficiency and enabling the process of vacuum mode stabilization during the operation of milking equipment
Authors: Aliiev Elchyn , Paliy Andriy , Paliy Anatoliy , Kis Viktor , Levkin Artur , Kotko Yana , Levchenko Iruna , Shkurko Maryna , Svysenko Sofiia , Sevastianov Vitalii 
Published: January 2023

A scientific hypothesis has been put forward, according to which an increase in the efficiency of using a vacuum system of milking equipment with an upper milk line with mechanical pulsators can be achieved by predicting its residual resource. As well as with the subsequent planning of maintenance and the identification of patterns and dependences characterizing these processes.
As a result of experimental studies of changes in the technical and technological parameters of the vacuum system of milking equipment with an upper milk line with mechanical pulsators, the theoretical dependences obtained with their correlation coefficient r=0.971–0.972 were empirically confirmed. Namely, the magnitude of the working vacuum, the pulsation rate, the ratio of pulsations, and the tension force of the nipple rubber, depending on the time of operation. It was established that after 175 hours of operation of the milking stationary installation, the value of the working vacuum decreased by 4 %, the pulsation frequency – 14 %, the ratio of pulsations – 16 %, and the tension force of nipple rubber – 21 %.
On the basis of the obtained dependences included in the procedure for forecasting the resource of the vacuum system of milk-milking equipment with an upper milk line with mechanical pulsators, the software package «Alt viewer 1.0» was developed. It is designed to display and automatically process the measurement results of the technical and technological parameters of milking equipment using the designed Tester of milking machines, v.2.0. The software performs the following main functions: reading the measurement results from the memory card, decoding them, displaying them in tabular and graphical forms. As well as the calculation of the parameters of pulsations and the formation of a report, forecasting the resource of the nodes of the vacuum system. The program also provides for the storage of information on the calibration coefficients of pressure sensors, air flow meter, as well as the frequency of polling sensors when measuring pulsations and fluctuations of the working vacuum
Development of the concept of building project management systems in the context of digital transformation of project-oriented companies
Authors: Teslia Iurii , Khlevna Iulia , Yehorchenkov Oleksii , Yehorchenkova Nataliia , Grigor Oleg , Kataieva Yevheniia , Latysheva Tatiana , Prokopenko Tеtiana , Tryus Yuriy , Khlevnyi Andrii 
Published: January 2023

An analysis of the impact of new global trends, such as Industry 4.0, on project-oriented companies was performed. Based on the analysis, the research problem is formulated, which consists in the need to create project management systems in accordance with the concepts, ideas, principles and methods of digital transformation of project-oriented companies. Project management processes in the conditions of digital transformation of project-oriented companies are defined as the object of research.
An approach to the creation of project management systems is proposed, which is based on the need to adapt the organizational, methodological and technological components of these systems to the specifics of a project-oriented company and the conditions of digital transformation. Based on this approach, the methodological, organizational and technological components of project management systems were improved. As part of the organizational component, a structural and functional model of project management is proposed, which takes into account the conditions of digital transformation of a project-oriented company. Within the framework of the methodological component, it is proposed to use management meta-methodology to create a project management methodology specific to the company's conditions and digital transformation processes. A digital interpretation of matrix information technologies for the technological component is proposed.
An organizational and technological model of implementation of project management systems in the conditions of digital transformation of companies was developed.
The conditions for the practical use of the concept are given: the systematic organization of the digital space and the availability of qualified specialists in the creation of project management systems. The implementation of the concept made it possible to reduce the project execution time by 5–20 %, as well as project cost due to more rhythmic work performance
Development of models of the electromagnetic environment in buildings and urbanized areas
Authors: Levchenko Larysa , Ausheva Nataliia , Burdeina Nataliia , Aznaurian Iryna , Biruk Yana , Kasatkina Natalia , Matvieieva Iryna , Nazarenko Vasyl , Nikolaiev Kyrylo , Tykhenko Oksana 
Published: January 2023

A set of measures and means to control the electromagnetic situation of the environment in the territories of urban development, in buildings and individual premises has been substantiated and developed. The simulation tools show the ability to rationalize the parameters of overhead lines with voltages of 220 kV and below, which will reduce the electromagnetic load in the territories. Modeling the propagation of fields from underground high-voltage lines has established that the values of magnetic fields compared to overhead lines are lower up to 30 times. Models of propagation of electromagnetic fields of very high and ultrahigh frequency were built. Sources of electromagnetic fields of non-production origin in industrial buildings have been investigated. Uncompensated currents in power networks with nonlinear electric consumers generate magnetic fields by induction of 0.35−1.20 μT, which exceeds the maximum permissible levels of operation of computer equipment. Leakage currents on grounded metal structures generate magnetic fields with 1.52−6.75 μT.
Simulation of the propagation of electric and magnetic fields of components of personal computers of controlled ranges according to the MPRII standard was carried out. Models of propagation of the magnetic field of industrial frequency around electric motors and generators with their cross sections were built. On the basis of such models, design schemes for placing equipment in production areas are selected or places of safe stay and movement of personnel are selected. The expediency of using shielding to reduce field levels to safe values due to coating surfaces with liquid protective mixtures was shown. Metal-containing composition based on water-dispersion paint makes it possible to reduce the level of magnetic field of industrial frequency by 2.5−2.6 times, electric field by 1.6−1.7 times, electromagnetic field of industrial frequency – by 1.2−1.3 times.
Estimating the stability of steady motion of vibration machines operating on the somerfeld effect using an empirical method
Authors: Filimonikhin Gennadiy , Amosov Volodymyr , Haleeva Antonina , Ienina Iryna , Mezitis Mareks , Nevdakha Yuriy , Strautmanis Guntis , Vasylkovskyi Oleksii 
Published: January 2023

One-, two-, and three-mass vibration machines with translational motion of platforms and a vibration exciter of a ball, roller, or pendulum type with several loads were studied. The empirical criterion for the onset of auto-balancing was applied in the extended formulation.
It has been established that a single-mass vibration machine has one resonant speed, and:
– at the after-resonance speeds of rotation of loads synchronously with the rotor, the auto-balancing mode becomes stable;
– at the pre-resonance speeds of rotation of loads, loads tend to gather together.
In a dual-mass vibration machine, there are two resonant speeds and one additional speed located between two resonant ones. The auto-balancing mode is stable when the loads rotate synchronously with the rotor at the following speeds:
– between the first resonant speed and the additional speed;
– greater than the second resonant speed.
At other speeds of rotation of loads, loads tend to gather together.
The three-mass vibration machine has three resonant speeds and two additional speeds, located one by one between adjacent resonant speeds. The auto-balancing mode is stable when the loads rotate synchronously with the rotor at the following speeds:
– between the first resonant speed and the first additional speed;
– between the second resonant speed and the second additional speed;
– greater than the third resonant speed.
At other speeds of rotation of loads, loads tend to gather together.
In a single-mass vibration machine, the value of the resonant speed does not depend on the viscosity of supports. In dual-mass and three-mass vibration machines, all characteristic speeds depend on the viscosity of supports. With small forces of viscous resistance, the values of these speeds are close to the characteristic speeds found in the absence of resistance forces.
Design of the inverter in high accuracy and development of work therein by using compound ligation
Authors: Baqir Muhammed Hussein , Haziq Nor Mohd , Wahab Noor Izzri Abdul 
Published: January 2023

A ligation (CL) system with a very high frequency in an inverter was used, it is a novelty in this study. We also employed a three-phase dynamic load (positive sequence voltage) to correct the power factor and account for active and reactive power in the output system this work is a novelty. The technique through compound ligation (CL) can improve inverter output waveform by reducing losses caused by ingrained agents in voltage source inverters (VSI), such as dead time caused by overload or voltage drop in an inverter's output, or abnormal load current conditions such as a short circuit current occur in the output stage of the inverter, and so on. The invention relates to the conversion of D.C. to A.C. power inverters, it is preferable to use compound ligation to achieve high efficiency, the device is lightweight, and has low losses and good precision. In addition, the present invention relates to improving an inverter load request sensation circuit, smoothing operational current, inverter response, and inverter spontaneous power factor improvement, as well as correction of the reactive power of passive components. In addition, an inverter with high active power (P) equal to (2.6×106 Watt), reactive power (Q) (5.4×107 VAR), was designed, and used positive sequence voltage (1.6×108 Watt ), as well as the switching period (10µs), The system's total harmonic distortion (THD) in voltage and current was 0.11 percent, while the system's accuracy was 99 percent. This is developed by using FPGA and oscillator circuit and programmable peripheral interface 8255 A as well as, ultrasonic PWM with a high-frequency range of (20–500 kHz) as demonstrated evidenced by the results obtained