bluuebunny/crossref_metadata_2025 huggingface dataset:
Faisabilité et bénéfice du décubitus ventral sous ECMO-VV au cours du SDRA
Authors: Bousquet Giovanni , Roch Antoine , Hraiech Sami , Guervilly Christophe , Valera Sabine
Published: March 2024

L’assistance respiratoire extracorporelle veino-veineuse (Extracorporeal Membrane Oxygenation (ECMO-VV)) s’est imposée comme un traitement de recours dans les cas de syndrome de détresse respiratoire aiguë (SDRA) les plus sévères malgré le positionnement en décubitus ventral (DV).  La question de l’intérêt et de la faisabilité de la poursuite du DV chez les patients sous ECMO-VV est importante compte tenu d’une part du bénéfice attendu mais aussi d’autre part, de la difficulté technique à sa mise en œuvre chez ces patients. La majorité des études observationnelles montre une amélioration supplémentaire de l’oxygénation en DV et parfois après DV chez les patients sous ECMO-VV. De plus, plusieurs méta-analyses d’études comparatives non randomisées suggèrent une diminution de la mortalité avec l’utilisation du DV, plutôt précoce et prolongée. Des études cliniques randomisées sont toutefois nécessaires afin d’en préciser les indications et les modalités. Dans cette mise au point, nous abordons tout d’abord le rationnel physiopathologique relatif à l’utilisation de cette technique chez les patients sous ECMO-VV puis nous discutons ses éventuelles indications et sa faisabilité. Enfin, nous évoquons ses aspects pratiques.
10 choses à savoir sur le patient transplanté cardiaque en réanimation
Authors: Doman Marc , Para Marylou , Caudron Julia , Rozencwajg Sacha , De Montmollin Etienne
Published: March 2024

L’admission en soins critiques du patient transplanté cardiaque est fréquente aussi bien en post opératoire immédiat qu’à distance de la transplantation. La prise en charge de ces patients relève d’une approche multidisciplinaire en raison des nombreuses problématiques hémodynamiques, cardiaques, infectieuses, immunologiques et pharmacologiques. Nous aborderons dans un premier temps le péri-opératoire de la transplantation cardiaque avec ses complications spécifiques, puis les problématiques pouvant survenir plus à distance : les infections bactériennes et opportunistes, la gestion des immunosuppresseurs, le diagnostic et le traitement du rejet aigu, la vasculopathie du greffon, l’insuffisance rénale et enfin la place de l’assistance circulatoire.
Recherche bibliographique : comment rester à jour et initier une recherche ?
Authors: Dauvergne Jerome , Blanchard Pierre-Yves , Poiroux Laurent , Constan Adrien
Published: March 2024

La recherche documentaire peut servir plusieurs objectifs : répondre à une question clinique, préparer un protocole de recherche, un cours, une présentation orale ou même actualiser ses connaissances. Être à jour des dernières publications scientifiques demande une méthode afin d'identifier les articles pertinents.  Nous proposons, au travers d’un article didactique, les bases pour organiser efficacement sa recherche documentaire. Ensuite, afin d’être tenu informé au fur et à mesure des nouvelles publications, les moyens permettant de conduire une veille scientifique sont abordés. Enfin, il convient d’organiser sa bibliographie et les publications à conserver. Des méthodes ainsi que des outils sont disponibles à cet effet. Nous vous en suggérons quelques-uns sans que la liste n'en soit exhaustive.
Analysis of Science Laboratory Management to Support Science Learning: A Systematic Review
Authors: Setiya Rini Endah Febri , Bramastia Bramastia , Aditia Kevin , Fitriani Fitriani , Siswanto Predy
Published: March 2024

Purpose of the study: An Merdeka curriculum requires students to be able to acquire scientific attitudes and process skills in science learning. Laboratory management is very important in supporting science learning. This research aims to analyze the management of science laboratories to support science learning.
Methodology: This type of research is qualitative research using a systematic literature review method. The population in this study was 60 articles originating from Google Scholar with publications from 2018 to 2023 which were then filtered again and a sample of 18 articles was obtained. The data analysis technique uses the matrix method.
Main Findings: Based on the results of a systematic literature review analysis, it is known that laboratory management in several schools has factors inhibiting laboratory management, such as the unavailability of laboratory personnel and technicians, multifunctional laboratory space, allocation of time for laboratory use, and lack of infrastructure in science laboratories. The conclusion in this research is that based on a review of literature studies, it is known that in the management of science laboratories in junior high schools, in some literature there are still inhibiting factors in its management.
Novelty/Originality of this study: The novelty in this research is the existence of a literature study which discusses the management of science laboratories in supporting science learning.
Local Knowledge of Traditional Medicine and Ethnic Food Duano, Kerinci and Suku Anak Dalam Jambi As a Natural Science Learning Resource
Authors: Mustakim Ardi , Hariyadi Bambang , Hamidah Afreni , Falani Ilham
Published: March 2024

Purpose of the study: The aim of this research is to explore the concept of science (biology, physics, and chemistry) in traditional ethnic medicine and food of the Duano, Kerinci, and Suku Anak Dalam Jambi.

Methodology: This research examines the concept of science based on traditions and local knowledge as a source of science learning (biology, chemistry, and physics). Type of qualitative research with an ethnographic approach. Data was collected through observation, interviews, FGD, and documentation using Spradley model data analysis.

Main Findings: The research found that the Duano Dalam tribe has local traditions and knowledge, such as menorah sunburn, marine ecology, lung, and gulai making. The Kerinci tribe has local knowledge about ethnic medicine and food, including Betemas/Tasapa and surian chili sauce. Meanwhile, the Anak Dalam (SAD) tribe has a tradition of Besale and local knowledge of Batangas and fish Pekasam food. The collection of traditions and local knowledge of each tribe has the potential to become a basis for science concepts in learning.

Novelty/Originality of this study: The novelty or originality of the research entitled “Local Knowledge of Traditional Medicine and Ethnic Food of the Duano, Kerinci, and Anak Dalam Tribes as a Natural Science Learning Resource" lies in several key aspects. These aspects are 1) Local traditions and knowledge that can be used as a basis for science learning, 2) cultural and ethnographic perspectives as sources of science learning, 3) Interdisciplinary approaches, 4) Cross-Cultural Learning Potential, and 5) Conservation and Sustainable Practices.
Enhancing Science Process Skills and Academic Performance in Biology: The Impact of Practical Work
Authors: Apeadido Shine , Opoku-Mensah Douglas , Mensah Gabriel Opoku
Published: March 2024

Purpose of the study: This study aims to determine whether the use of practical work can enhance General Science students’ science process skills acquisition and academic performance students in biology at Juaben Senior High School in Ghana. The study sought to answer two research questions and test one hypothesis at a 0.05 significance level.  

Methodology: The study used action research, and the sample consisted of 45 students, selected through convenience sampling. The study used various instruments, including pre- and post-tests, weekly intervention exercises, and scoring rubrics, to collect data. The analysis of the gathered data employed descriptive statistics and a paired sample t-test to reveal and solidify the findings of the study.

Main Findings: According to the study’s results, the use of practical work resulted in a steady increase in students’ acquisition of science process skills in each cycle, and all students were able to demonstrate some degree of required science process skills at the post-test level in contrast to the pre-test level. Furthermore, the pre- and post-test outcomes of a paired sample t-test analysis with a 95% confidence level showed a significant improvement in the academic performance of the students, attributed to practical work.

Novelty/Originality of this study: This research update confirms the need for practical work in biology education and shows that incorporating it into biology lessons enhances students’ acquisition and development of science process skills, which in turn enhances their academic performance.
Evaluation of Natural Science Subject Teachers as Improving the Quality of Student Learning at Madrasah Tsanawiyah
Authors: Madyan Madyan , Atika Nurul , Selvia Dora , Hayati Syamsimar , Salsabilah Wanada Siti
Published: March 2024

Purpose of the study: The aim of this research is to evaluate the performance of Natural Sciences teachers at MTs Nurul Huda in Muaro Jambi Regency.

Methodology: This research uses a descriptive qualitative approach. The sampling technique is the Purposive sampling technique. The sample in this research was the Natural Sciences teacher at MTs Nurul Huda in Muaro Jambi Regency. Data collection in this research was carried out using document analysis and interview techniques. Document analysis using document assessment sheets. The data analysis technique used is the Miles & Huberman technique.

Main Findings: Based on the results of interviews with MTs Nurul Huda Natural Sciences teachers in Muaro Jambi Regency, planning, implementation, and assessment were good. Likewise, attention from foundations and school principals should give full attention to teachers so that they can continue to develop their potential and improve their teaching performance.

Novelty/Originality of this study: This research can provide a more comprehensive and contextual view in evaluating teacher performance and efforts to improve the quality of learning at MTs Nurul Huda in Muaro Jambi Regency. This can also support updates in general teacher performance evaluation methods in the educational environment.
Using a frequency vibration approach, examine the impact of screw rotor clearance on the screw housing in an 11kW compressor
Authors: Tri Haryono  , Deni Deni Arif Rahman , Subekti Subekti  , Abdul Hamid
Published: March 2024

A screw compressor is one of the industrial machines needed for productivity and use in today's production. Industrial machines generally use pneumatic systems with the help of compressed air supplied by a compressor machine. The compressor working system must receive very special attention. Maintenance and prevention of damage to air screw compressor machines is very necessary, especially maintenance and prevention of damage to rotary screw air compressors. Problems that often occur with the shaft will result in reduced air supply flow or unstable air pressure resulting in disruption of the production line. The aim of this research was to discuss the vibration values produced against the rotor clearance from the ideal output on male and female screw compressor rotors using the frequency analysis method, taking the vibration values at the screw compressor housing point using an Accelerometer sensor and a Fast Fourier Transform (FFT) tool. The analyzer rotates at 1500 rpm in the X, Y and Z axes at each predetermined point. Research shows that the clearance is set at 0.03, 0.05 and 0.08. In this research, the high frequency sample values of 1x 25 Hz, 2x 50 Hz, and 3x 75 Hz often appear in each vibration data of 0.03 and 0.05, at the vibration frequency range value of 0.08 none appear. This shows the results that the ideal rotor clearance value is at a distance of 0.08 because there is no frequency graph of 1x, 2x, and 3x rpm at each point and axis on the end housing of the screw rotor compressor
Material analysis of tool feed on scrap machines using the vibration method
Authors: Kharis Surnadi Ahmad , Subekti Subekti
Published: March 2024

Flexibility comes from the cutting force generated when the workpiece and tool react and are moved to different areas of the scrap machine. The chisel will get damaged as a result. The material and cutting speed that are used can cause damage. Given this, further studies employing the vibration method are required to determine the ways in which material affects the speed at which scrap is chopped. PVC, iron, and aluminum 5052 were the materials used in this investigation. The cutting rotational speeds varied from 32 to 80 m/min. To measure vibration, the accelerometer is positioned along the x, y, and z axes.  The measurement outputs of the accelerometer are connected to the FFT Analyzer, which performs analysis using Matlab. When comparing cutting speeds above or below 50 m/min, the research results indicate that the x-axis has the largest amplitude and the most form variants. The most widely used material is PVC, which is followed by iron and aluminum. This is because, unlike aluminum and iron, which have microstructures in the form of crystal grains, PVC is a thermoplastic polymer with a microstructure made of chain molecules. Because all of the cutting energy is used in the frictional action between the chip and the workpiece when the tool is being used, the high frequency is the result. As a result, the friction on the sliding plane is breaking up atomic or molecular bonds. Additionally, the cutting force exerts a significant amount of pressure on the tool's wearing active surface
The effect of refrigerant filling pressure on split AC performance with variations in refrigerant R22, R134A, and R290
Authors: Nugroho Agung , Alfianto  , Priangkoso Tabah
Published: March 2024

R-22 refrigerant has been recognized as a major cause of climate change and ozone layer depletion, leading to increased interest in finding more environmentally friendly alternatives. Two alternatives being considered are R-134a and R-290. The main objective of this research is to compare the Coefficient of Performance (CoP) performance of split ACs using three types of refrigerants, namely R-22, R-134a, and R-290, taking into account the environmental impact and operational efficiency. The research method involved retrofitting a 1 PK split AC which initially used R-22 with three different types of refrigerant as an experiment. The research process includes test equipment design, equipment installation, and feasibility testing before carrying out experimental testing. Tests were carried out with variations in refrigerant charging pressure of 70 psi, 75 psi, 80 psi, 85 psi, and 90 psi. The research results showed that the largest COP was found in the R-290 refrigerant, reaching a value of 0.86 at a filling pressure of 90 Psi. The largest COP value for R-22 was also found at a filling pressure of 90 psi, namely 0.66. Meanwhile, R-134a achieved the highest COP value at a filling pressure of 90 psi, with a value of 0.57 at a variation of refrigerant filling pressure of 90 Psi. In conclusion, this study provides better insight into the efficiency and environmental impact of the three types of refrigerants discussed. It also provides a useful information basis for the selection of suitable refrigerants in split air conditioning systems, with the aim of environmental conservation and achieving optimal performance
Analysis of cooling loads and air circulation in the passenger compartment of the CR400AF fast train trailer car
Authors: Moch. Sugiri  , Parman Sinaga  , Andy Fii Aunillah
Published: March 2024

The air conditioning system is a system that regulates air circulation and air temperature on the train. The temperature standard for fast train passengers is in accordance with Permen No. 7th year 2022 is 22°C - 26°C. To achieve this temperature, a cooling system is needed that is suitable for the cooling load. This research was conducted on the CR400AF fast train trailer car with the aim of knowing the factors that influence cooling loads, calculating and analyzing cooling loads which are used as a reference in determining air conditioning technical specifications, as well as analyzing air circulation that affects air humidity. The data analysis method used is the quantitative data analysis method. This method is carried out by collecting primary and secondary data to be used as a basis for calculations in answering the problem formulation. Data analysis was carried out by calculating the OTTV (Overall Thermal Transfer Value) according to SNI 03-6389-2000, calculating the cooling load using the CLTD (Cooling Load Temperature Difference) method according to SNI 03-6572-2001, and carrying out an air circulation test referring to Permen No. . 7 of 2022. From the results of the analysis and calculations, the OTTV value is 15.6 Watt/m2. Room eligibility standards according to SNI 03-6389-2000 standards are OTTV values not greater than 45 Watt/m2. The internal cooling load is 15,010 W, the external load and ventilation is 22,688.92 W, the total cooling load is added 10% safety factor of 41.47 kW, the cooling capacity of the AC unit based on technical specifications is 45kW. The average value of air flow velocity during the air circulation test is 0.3 m/s. according to Ministerial Regulation No. 7 of 2022 maximum air circulation speed of 0.5 m/s. From several analysis and calculation results, it can be concluded that the passenger space of the CR400AF fast train trailer car is standard and feasible to operate
Performance analysis of solar photovoltaic thermal (PV/T) dryer for drying moringa leaf
Authors: Tonadi Een , Niharman  , Besti Wiranto
Published: March 2024

Though its considerable solar energy potential prevents equal distribution throughout the region, Indonesia has not made the best use of it, particularly when it comes to integrated drying and electrical technologies. There are a number of drawbacks to traditional direct drying, particularly with regard to food goods. These include the possibility of contamination, discolouration, and animal disturbance. The purpose of this research is to develop, build, and evaluate an integrated drying technology—a solar photovoltaic thermal (PV/T) dryer—that can generate heat and electricity at the same time. The dried material used in this dryer is moringa leaves. This study employs an experimental design methodology, first developing and building a greenhouse-style PV/T dryer with three levels of shelves. Second, a test of the tool's functionality was conducted using 1000 grams of material on each shelf. Measuring devices such digital thermocouples, multimeters, solar power meters, and humidity meters are utilized to get test parameter data. The average daily solar intensity, according to the research findings, is 436.60 watts/m2. Shelf 1, which is next to the collector outlet, had the highest average temperature (53.9 °C), whereas shelf 3 had the lowest average temperature (37.1 °C). With an average voltage of 30.89 volts and an average current of 4.08 amperes, solar panels generate an average power of 85.65 watts. In the meantime, the material's mass decreased after drying for nine hours, on average by 72%, according to the drying data. With an average power of 86.65 watts, an average temperature on the third shelf between 37.1 °C and 40.6 °C, and an average mass reduction of 72%, it can also be stated that this PV/T dryer is quite successful for drying.
Simulation on the influence of the shape of the carabiner as a hanging accessory on stress distribution using Autodesk Fusion 360
Authors: Rizki Muhammad , Gamayel Adhes , Zaenudin Mohamad
Published: March 2024

Engineering and innovation in the manufacturing process will continue to be carried out. This aims to ensure that there are always improvements in every product made, both in terms of design, materials used, and how the production process is carried out. Product design innovation is often also aimed at efficiency and reducing product production costs. Innovation in a product must be to improve, not reduce the value and usefulness of the product being made. The aim of this research is to determine the distribution of stress and strain as well as the safety factor of carabiners as hanging accessories using polypropylene polymer material. The research uses experimental methods, namely observing the simulation results that occur in the form of stress, strain and safety factors, as well as knowing the cause and effect phenomena that occur in the design of a carabiner for an accessory. By changing the shape of each design to the upper end of the frame in the direction of the carabiner gate, R15, R30 and R45. As well as varying the load given by 10 N to 100 N, with an increase in force of 10 N in each simulation carried out, with axial and vertical loading directions. By ignoring the type of gate and the shape of the connection on the carabiner gate. The different shapes in each carabiner design cause differences in the tension distribution that occurs. The R15 design has a maximum stress value at a load of 100 N, namely 25.03 MPa, the R30 design is 33.78 MPa, and the R45 design is 63.61 MPa. The vertical loading direction achieves a good safety level of 4.0 at a load of 20 N in the R15 and R30 designs. Meanwhile, axial loading does not achieve product safety targets. The difference in calculating the factor of safety is 4.0 between the results of computer computing and the results of analytical calculations using a formula, namely 1% of the maximum limit of 5%.
Design and manufacture of mechanical drive systems for road sweepers on flat surfaces
Authors: Iqbal Raihan  , Mirzal Lubis  , Siregar Ahmad Marabdi , Siregar Chandra A , Affandi
Published: March 2024

The sweeper works by utilizing pushing force because it does not use a motor, so it is environmentally and energy friendly. The manufacturing and assembly process is carried out after all machine components are made according to the designed sizes. The working principle of this machine is that the wheel is the driving source using a gear and chain transmission. The driving source for the directional broom is located on the left side of the wheel, using an umbrella gear to change the direction of rotation of the broom to the opposite direction. Meanwhile, for the distribution broom, the driving source is located on the right side of the wheel. By using two gears that touch each other and the difference in the number of teeth, namely three to one, can produce a fast sweeping speed. The function of the directional broom is to direct rubbish that is in the corners of walls or rooms to the middle of the machine. Meanwhile, the function of the distribution broom is to distribute waste to the tub which has been directed by the guide broom towards the middle of the machine. After testing, it turned out that this sweeping machine can optimally pick up all the rubbish on a flat surface along with the dust. The results of the design of this machine have been able to produce very good performance, apart from saving time it also produces fairly clean sweeping results
Experimental study of motor cycle performance with exhaust manifold using torque expansion chamber
Authors: Subroto Subroto , Sartono Putro  , Pramuko Ilmu Purboputro
Published: March 2024

The Motorcycle performance can be improved by modifying the intake manifold and exhaust manifold. In this research, the exhaust manifold was modified using a Torque Expansion Chamber (TEC), namely adding a tube to the exhaust manifold with a certain geometry and dimensions so that the heat carried by the exhaust gas is retained and does not directly escape through the exhaust. This test aims to determine the performance of a motorbike with a modified exhaust manifold by adding 250 mm tubular TEC. TEC installation with placement at 40%, 50%, and 60% of the exhaust manifold length. Engine performance including torque, power and specific fuel consumption is measured using the Dyno Test. The research results show that the use of the Torque Expansion Chamber has an effect on motorbike performance. Highest torque with 50% TEC placement and 60% TEC placement at 5000 rpm. Highest power with 50% TEC placement and 60% TEC placement at 6000 rpm to 6500 rpm. Lowest specific fuel consumption with 50% TEC placement at 6000 rpm
Effect of eccentric mass on rotor dynamics as a source of harvesting energy vibration
Authors: Noor Al-Fauzan Syahputra Muhammad , Subekti Subekti  , Nur Indah
Published: March 2024

This research focuses on the potential for vibration energy from the use of eccentric masses in dynamic rotors to become an electrical energy source. Prior studies on eccentric mass in dynamic rotors were primarily concerned with examining the rotor's vibrational characteristics; however, little research was done on converting vibrational energy into electrical energy. The purpose of this study is to ascertain the maximum amount of electrical energy that can be produced by dynamic rotor vibrations using an eccentric mass. Utilizing an electromagnetic energy harvester, an experimental study is the methodology used. With a rotor rotation speed of 450 rpm, the eccentric mass variations used are 6.5 grams, 8.5 grams, and 10.5 grams. Matlab is used in this research to process data. The highest energy, using an eccentric mass of 8.5 grams, was found to be 24.15 mV. Nevertheless, this study shows that while the eccentric mass has an impact on the amplitude, it has no effect on the voltage. In order to increase and improve the efficiency of the electrical energy produced, further research on the utilization of vibration energy from dynamic rotors can be guided by the findings of this study
Painting robot with three axis motion
Authors: Renggi Yunatatak  , Jajang Jaenudin  , Luqman Hakim  , Mustaza Ma’a
Published: March 2024

Paint was applied directly to the painted surface while painting with a brush. There are occasionally unsatisfactory outcomes, such as paint stacking or streaks remaining. Spray guns yield better paint results, therefore a robot was developed that can regulate the spray gun's movement in order to apply paint. A painting robot that resembles an arm is one that has three axes of movement. The robot can move left-right on the x axis, up-down on the y axis, and back-front on the z axis. Its end effector is a spray cannon. An ultrasonic sensor is used to measure the distance between components and the spray gun; when the sensor measures near distances, such as between 4 and 8 cm, the test sensor distance measurements have a larger average error. When the test reading distance is increased from 10 cm to 14 cm, the average error reduces. Superior painting outcomes can be achieved with a paint distance of 10 cm, an air pressure of 80 psi, and a spray gun arm movement speed of 25 rpm.  With average x-axis movement of 74.6 cm, y-axis movement of 14.8 cm, and z-axis movement of 88.2 cm, the largest volume that can be painted is 97,517.5 cm3. The rotation of the arm is used to determine the angular rotation needed to paint components. Painting the left side of the component at an angle of 10°, the back side at an angle of 100°, the right side at an angle of 190°, and only painting the front side of the component at the required angle of 90° require the rotational movement of the arm to the left.
Harvesting energy vibration derived from the rotational speed of a A 4-stroke engine
Authors: Farezi Andriansyah  , Nur Indah  , Subekti Subekti
Published: March 2024

The utilization of vibration energy from a 4-stroke engine as a potential source of electrical energy. Previous studies have focused on analyzing the vibration characteristics and frequency response functions of the 4-stroke engine, but there is a lack of research on harnessing vibration energy as a source of electrical energy. Therefore, this research aims to fill this gap by developing a system to harness the vibration energy from the 4-stroke engine, making it a primary focus of the study. The method employed is an experimental study involving data collection using an FFT Analyzer and Matlab. The research results indicate the presence of several mode shapes in the 4-stroke piston motor. The energy harvesting device utilized is of the electromagnetic type. However, the research reveals that the utilization of vibrations from the 4-stroke piston motor as a source of electrical energy is still not efficient and requires further development. There are various mode shapes in the 4-stroke piston motor at different rotational speeds, but the electromagnetic energy harvesting device used is unable to generate significant electrical energy. Therefore, this research provides a foundation for conducting further research in utilizing the vibrations of a 4-stroke piston motor as a more efficient source of electrical energy
Investigation of harvesting energy vibrations due to the feed process on milling machines
Authors: Suryadi Andi , Subekti Subekti  , Nur Indah
Published: March 2024

Milling machines are machines used in the production process. The time required during the machining process must be more efficient in order to obtain the desired production capacity. The aim of this paper is to utilize vibrations originating from milling machines in industry as a source of Harvesting Energy Vibration. The research was carried out by varying the feeding depth of the milling machine so that it could be seen how much stress was produced. The Lushan Model ZX32 milling machine was used in this research, where vibrations from the vibration source were measured using an FFT Analyzer connected to an Accelerometer Sensor and Harvesting energy vibration connected to an Oscilloscope. Meanwhile, the workpieces used in this research were Aluminum 5052 and PVC. The results of the research were that on PVC material with an ingestion depth of 1 mm, the vibration frequency at 210 rpm was 71 Hz, the amplitude was 1.38 mm/s2, resulting in a harvesting energy of 6.449 mV. And the results of research using aluminum at 210 rpm rotation with a feeding depth of 3 mm obtained a vibration frequency of 90 Hz with an amplitude of 1.508 mm/s2 producing a harvesting energy of 5.856 mV. The research results show that the PVC material produces higher harvesting energy vibration at a depth of 1 mm, and the aluminum material produces higher harvesting energy vibration at a depth of 3 mm
The Influence of e-glass epoxy composite laminate material application on the crack pattern of cylinder concrete column cross-section
Authors: Achmad Jusuf Zulfikar  , Ritonga Din Aswan A , Ari Purnomo  , Toni Erdiansyah  , Ahmad Rivaldo
Published: March 2024

In order to better understand the phenomenon of applying GEC reinforcement to RCC based on the percentage of surface crack pattern (PCP), this research will use e-glass epoxy composite laminate (GEC) to obtain the damage pattern of reinforced concrete column specimens (RCC) utilizing GEC. Additionally, it will compare the splitting tensile strength (STS) and SCP. In accordance with ASTM C496 guidelines, the RCC specimens used in this investigation had a cylindrical shape and measured 150 mm in length and 50 mm in diameter. GEC material, consisting of 0–4 layers of woven e-glass fiber sheets, was applied as an extra layer on top of the RCC. In compliance with ASTM C496 guidelines, a Universal Testing Machine (UTM) was used to perform the split tensile test. With the aid of Adobe Photoshop software, the Histogram approach was used to calculate the crack pattern's proportion. The study's findings demonstrated that the specimens reinforced with four layers of GEC exhibited the highest damage pattern. This suggests that the reinforced specimens must be subjected to a sizable load in order to be damaged. Hence, the damage that occurs in the specimens can be lessened by applying GEC layers on RCC. Further information about the performance of RCC reinforced with GEC is also provided by a comparison of the splitting tensile strength and the percentage of fracture pattern
Analysis of the impact of exhaust gas emissions on diesel fueled vehicles in view from the year of manufacture (Case study on the Mitsubishi L 300 vehicle)
Authors: Irfan Dwi Farilla  , Akbar Ali , Mulyadi  , Rachmat Firdaus
Published: March 2024

Air pollution is a condition caused by exhaust gas from motor vehicles operating on the highway. To minimize greater air pollution, the government is making preventive efforts by carrying out regular vehicle emission tests which are currently being carried out targeting transport vehicles. This is triggered by the increasing development of the automotive industry so that every year manufacturers produce these vehicles to meet the vehicle market, especially transport vehicle. With the increase in the number of vehicles every year, this is one of the causes of air pollution, so it needs to be controlled. This research aims to determine the effect of vehicle exhaust emissions on the year of vehicle production, in diesel fueled vehicles. The method used is an experiment using two-way Anova analysis on the results of tests carried out on Mitsubhisi L 300 vehicles with a total of 30 test samples, by testing vehicles produced in 2017 - 2022. The results of the research show that older vehicles will produce gas emissions. tall one. This is in accordance with the results of the ANOVA test which accepts the statement that there is at least one vehicle age that has a significant effect on smoke concentration, so it can be concluded that vehicles with an old age, in this case 2017, have the potential to produce high emission gases, therefore preventive efforts need to be taken. to vehicle engines
Analysis of the effect of high falling water on the performance of hydroelectric power plants using whirpool type turbines
Authors: Mhd. Dimas Kurniawan  , Etanto Heiliano Wijayanto  , Siswo Pranoto  , Indra Hermawan  , Muhammad Idris
Published: March 2024

A hydroelectric power plant (PLTA) uses the flow of water as a source of energy. Evaluating the output of hydropower facilities, including the optimal height of the waterfall, turbine torque, electrical power, generator power, and generated efficiency, was the aim of the study. This study intends to investigate the power, torque, and efficiency that may be produced by a hydroelectric power plant with a whirlpool-type turbine, as well as how the height of falling water influences the operation of the plant. The experiment in this study measures three different waterfall heights with five different blade configurations. The study on the hydropower prototype involved three trials that collected data on torque, power, efficiency, waterfall height, and water discharge. The PLTA Prototype's best potential head in Test 3 was determined to be 0.01143, with a height of 0.67 meters, no sluice, and a diameter of 0.0625 meters. The lowest water outflow was discovered at a head of 0.55 meters with a water debit of 0.01036. The third attempt, which featured a sluice opening with a diameter of 0.0625 meters and a height of 0.67 meters (head), used the most water power in the experiment. The testing yielded the following results: 75.13 watts of water power, 5.16 watts of generator power, 0.233 N.m. of torque, 2.63 watts of turbine power with a generator load 3.73 watts without one, and 6.87% efficiency. Data gathered from the hydropower prototype's operation can be used to construct testing instruments for use in laboratories
Analysis of the level of effectiveness of using a simple spinner machine to drain oil in pothils
Authors: Intan Zahrani Mufidah  , Nisanty Eka Yuniar  , Nur Alifah Kusumaningtyas  , Siska Dwi Lestari  , Eli Trisnowati
Published: March 2024

Pothil is a common regional dish from the Magelang region prepared with cassava. The peeling and frying of the cassava is the first step in the process of manufacturing pothil. People still utilize manual cooking oil drainers during the pothil frying process, which makes them ineffective at draining the oil. Using a dynamo, which is a device that transforms mechanical energy into electrical energy, one can create a basic spinner machine to assist with oil draining. The purpose of this study is to evaluate the efficiency of a basic spinner machine for draining oil from pots and to ascertain the correlation between rotation duration and oil production volume. This study used a quantitative experimental design, where oil volume was the dependent variable and rotation duration was the independent variable. An efficacy test utilizing oil paper to view the oil beams on the pothil was used to gauge how efficient utilizing a spinner machine would be. The study's findings indicate that when compared to turning the spinner machine for one or two minutes, a spinner machine that is rotated for three minutes can create the most oil—21 milliliters. Consequently, the longer the spinning period, the more oil is generated and the more successful the spinner machine is in lowering the oil content of the pothil
Integrating PEVs into Smart Home Energy Management: A Vehicle-to-Home Backup Power Solution with Solar power system
Authors: Reddy T Ravi Sankar , Kumaraswamy I
Published: March 2024

This study focuses on leveraging the capabilities of plug-in electric vehicles (PEVs) to serve as an alternative power supply for suburban demands during disruptions, encompassing backup solutions, particularly in emerging or deprived regions. This initiative is part of an overarching strategy to establish household microgrids. Importantly, this utilization of PEVs for backup power is engineered to have no adverse impact on their primary function as electric vehicles. The proposed Vehicle-to-Home (V2H) system integrates seamlessly with solar photovoltaic (PV) charging. This synergy transforms the entire setup into a nano grid, a self-contained energy ecosystem. In a specific capacity, the plug-in electric vehicle (PEV) operates as a household load, utilizing its battery that gets charged either from solar photovoltaic (PV) systems or grid connections. The pivotal focus, however, remains on maximizing solar energy utilization, thereby reducing dependence on grid-based charging. To achieve this, a multi-faceted approach is adopted. Throughout daylight hours, various charging modes such as slow DC charging, fast DC charging, constant voltage, and constant current charging are employed to tap into and leverage solar energy resources effectively. The primary goals of this initiative include addressing various aspects: reducing household energy expenses, decreasing dependence on the conventional grid, enhancing power supply reliability to meet suburban demands during load shedding and power outages, and optimizing the utilization of solar energy from rooftop photovoltaic arrays. Essentially, this study aims to creatively integrate plug-in electric vehicles (PEVs), solar photovoltaics (PV), and smart grid technologies to improve energy resilience and efficiency in residential settings.
Advancements in Steel Surface Defect Detection: An Enhanced YOLOv5 Algorithm with EfficientNet Integration
Authors: Ren Fei , Zhang ZiAng , Fei Jiajie , Li HongSheng , Doma Jr. Bonifacio T.
Published: March 2024

Steel surface defect detection is of utmost importance for ensuring product quality, cost reduction, enhanced safety, and heightened customer satisfaction. To address the limitations of traditional steel surface defect detection algorithms, which often yielded singular detection results and suffered from high miss detection rates, we proposed an enhanced Yolov5 steel surface defect detection algorithm. In this approach, this paper employed the EfficientNet network as a replacement for the Yolov5 backbone network. Subsequently, we trained and tested this modified network on a steel surface defect dataset to mitigate the challenges associated with high miss detection rates and underperforming evaluation metrics. Our experimental findings underscored the superiority of the improved algorithm, particularly when compared to Yolov5. This enhanced algorithm exhibited substantial improvements across several key performance metrics, including Precision, Recall, mAP@0.5, parameter count, and pt file size. Noteworthy achievements included a 6.39% increase in Precision for Yolov5-EfficientNetB4, a remarkable 7.75% improvement in Recall for Yolov5-EfficientNetB0, and a 5.57% boost in mAP@0.5 for Yolov5-EfficientNetB6. Additionally, the pt file size for Yolov5-EfficientNetB0 saw a substantial 39.65% reduction, although it was important to note that the inference time for the improved algorithm increased. Among the models, Yolov5-EfficientNetB6 struck the best balance in terms of performance.
Simulation and Analysis of Optimal Power Injection System Based on Intelligent Controller
Authors: Assaf Abdullah Sami , Kurnaz Sefer
Published: March 2024

Many countries are seeing significant improvements in the fields of building, urban planning, technology, network management, and the need for diverse forms of energy and different generating techniques, as well as the necessity for low and middle distributing voltage in all areas. Depending on the needs of the user, starting needs, capacity, intended usage, waste output, and economic efficiency, many methods are used to generate this energy. To solve the problems brought on by the suggested excessive voltage of the provided system, energy collection devices can be used, and they can be used efficiently with smart grid intelligent control systems. A mathematical model was developed with four main components: simulation, correlation, and evaluation following the solar the program was set of photovoltaic panels solar panels, An Adaptive Neuro-Fuzzy Inference System (ANFIS) controller based on Maximum Power Point Tracking (MPPT), as well as 600-volt electric network, in order to examine and analyze the viability of the proposed network collaboration and storage of electricity in private photovoltaic networks based on solar energy. This phase next looks at the output power impact on the network, as well as the influence of network temperature and coincident radiation. An analysis was conducted to ascertain the impact of these basic limitations on actual use. This section covers the computer simulation of the proposed system. The final section contains the created system's block diagram. The system's input light is transformed into electricity that circulates in this system's power. The main electrical system with a 600-volt capacity can use this energy. The suggested system was evaluated using MATLAB simulation tapes and graphing for each system component, and the simulation outcomes of the entire system were considered.
Design of Enhanced Wide Band Microstrip Patch Antenna Based on Defected Ground Structures (DGS) for Sub-6 GHz Applications
Authors: El Issawi Mohamed Lemine , Konditi Dominic , Usman AD
Published: March 2024

In this paper a comprehensive comparative study of three distinct microstrip patch antenna (MPA) designs, each optimized for the sub-6 GHz applications, is presented. The initial design phase utilized a Rogers RT 5880 substrate with a permittivity (εr1) of 2.2 and a thickness(H1) of 1.42 mm. The proposed model achieved a resonance band ranging from 4.8 to 7 GHz, with a bandwidth of 2.2 GHz and a return loss (S11) of -20 dB. Subsequent enhancements involved integrating a Barium Strontium Titanate (BST) thin film (εr2 = 250, thickness(H2) = 0.005 mm), effectively shifting the operational band to 3.5-5.3 GHz. The final design iteration, which incorporated both BST and a Defective Ground Structure (DGS), represented a substantial advancement, achieving wideband operation from 1.8 to 6 GHz, expanding the bandwidth to 4.2 GHz, and improving the S11 to -25 dB. This integration also resulted in a compact antenna size of 30 x 26.5 x 1.42 mm³. These findings underscore the synergistic impact of BST and DGS in enhancing MPA design, marking a significant progression in antenna technology, vital for a range of wireless communication.
Skrining “GEMULEK” (Gigi, Mulut, dan KEK) pada Perempuan Usia Subur dalam Pencegahan Stunting
Authors: Girsang Bina Melvia , Sitohang Ance Marintan D , Elfira Eqlima , Sofyanti Ervina
Published: March 2024

Prevention of dental and oral health problems in pregnant women can be done by increasing knowledge and changing the behavior of pregnant women. The target audience for this community service activity are women of childbearing age, pregnant women, and posyandu cadres. The partner in this community service is the head of the posyandu cadre in Ujung Rambung village. The partner's problem lies in the emergence of dental and oral health problems and KEK during pregnancy. Screening activities for women of childbearing age in Ujung Rambung village include 12 components of dental and mouth screening, as well as upper arm circumference screening as an observation of nutritional status, and also detects the average age of women of childbearing age who attend as participants. Based on the results of the screening tabulation, it was found that 61.5% of the activity participants had cavities, and 73.1% had tartar. This condition is a condition that is at risk of developing tooth and mouth infections. Apart from that, in a number of other problems, 26.9% found cases of bleeding teeth when brushing their teeth, and they often experienced food stuck in their teeth (53.8%). In the study of measuring upper arm circumference (LILA) as a monitoring of nutritional status and chronic energy deficiency (KEK), the average LILA was 30.08 cm. This was also followed by monitoring of reproductive age with an average age of 32.7 years. Nutritional status and maternal health before, during and after pregnancy affect the early growth and development of children, starting from the womb. Gingivitis of pregnancy is inflammation of the gums experienced during pregnancy. Oral screening and the incidence of CED are important components that can be complied with during the early trimester of pregnancy.
COMPUTER TRAINING PROGRAMS AND ITS DEVELOPMENT
Authors:   EFL teacher, Fergana branch of Tashkent University of Information Technologies, named after al-Khorazmi, Uzbekistan, Baxtiyarovna Maxkamova Dildora
Published: March 2024

In today’s digital age, the use of computer training programs in education has become increasingly prevalent. Use of computer training programs in learning languages is one of the best recent and technological approaches in language learning and teaching, especially to strengthen the opportunities to achieve objectives of language pedagogy. Nowadays, many researchers and professionals get to know the significance of using various computer training programs in the procedure of language teaching and learning equally. These article aims to explore and analyze the theoretical background behind the methods of usage of computer training programs in language learning, especially in English lessons in the non-native speaking countries and to bring out the problems faced by both teachers and learners of English. In conclusion, the methods of usage of computer training programs in education are supported by several key theories in the field of educational.
CONCEPT AND LEGAL ANALYSIS OF THE CRIME OF ABORTION IN CRIMINAL PROCEEDINGS
Authors:   Acting Professor of the Department of Criminal law, Criminology and Anti-corruption of Tashkent State University of Law, Jumaevich Khaydarov Shukhratjon ,   Doctor of Philosophy in Law,Uzbekistan
Published: March 2024

This article reveals the concept of the crime of criminal abortion (abortion) and its characteristics, as well as a legal analysis of the crime of criminal abortion (abortion). Also, based on scientific analysis, national laws and legal documents are highlighted, as well as a number of declarations on the protection of reproductive health and the rights of pregnant women from various attacks. In addition, artificial termination of pregnancy in a place outside a medical institution in the case of criminal termination of pregnancy (abortion), medically possible cases of artificial termination of pregnancy are opinions expressed by legal scholars on the basis of scientific and comparative analysis.
HISTORY OF IDEALS OF HUMAN BEAUTY
Authors:   Karakalpak State University,Uzbekistan, Asamatdinova Zh.
Published: March 2024

This article tells about the role of a teacher in leading teenagers to self-consciousness. Some interesting and important key-words for teenagers are given in the article. The tasks and intellectual activities for teenagers are described here full.