bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of Learning Skills by Using a Computer Assisted Instruction on Problem Solving with Equations to Enhance Critical Thinking Skills of the Fifth Grade Students
Authors: Paengtip Pannee , Paengtip Sittichai , Dermrach Praewsree 
Published: April 2021

Abstract
The purpose of this study was to develop a computer assisted instruction about problem solving with equations to enhance critical thinking skills of the fifth grade students. Two phases were undertaken in the study. The first phase aimed to develop and monitor the quality of the CAI in which five experts on design and CAI were the main group to evaluate it. The second was to test and evaluate the CAI in which 30 fifth grade students within Bankotabaru School in Yala province were the main participants. The data collected within the first academic term of 2017 in Thailand were analysed using descriptive statistics, such as percentages, means, standard deviations, and t-test.
The results were that the CAI aiming to enhance critical thinking skills of the students were divided into 3 parts; 1) an introduction; 2) teaching processes; and 3) an evaluation. There was a higher percentage of critical thinking skills of the participants in association with before and after the use of the CAI at 52.18 and 80.41 with the difference value of 28.23 and the statistical significance of 0.05 level.
Utilization of stellarium-based activity: its effectiveness to the academic performance of Grade 11 STEM strand students
Authors: Acut Dharel P. , Latonio Rhett Anthony C. 
Published: April 2021

Abstract
This study was carried out to understand and bring to fore if a simulation-based activity is effective on the academic performance of the students which has a general outlook to enhance meaningful science learning. This study focused on effectiveness of the stellarium-based activity on the academic performance of Grade 11 STEM Strand students of Sotero B. Cabahug FORUM for Literacy, School Year 2017 – 2018. The respondents of this study were composed of 28 students. The data pointed out that data analysis results shows that by conventional criteria, the differences of the scores on the different competencies is considered to be extremely statistically significant Results revealed that the stellarium-based activity is effective in teaching the cycles of the sky. Statistical results showed that the academic performance of the respondents improved when taught using the stellarium-based activity. Thus, it is best to learn astronomy using simulations. Computer simulations have demonstrated the potential to facilitate this process by highlighting students’ misconceptions and presenting plausible scientific conceptions. From the results, students are recommended to use stellarium, where the process often involves open-ended investigations into a question or a problem, requiring them to engage in evidence-based reasoning and creative problem-solving, as well as problem finding. Furthermore, science educators are encouraged to use stellarium in teaching the cycles of the sky and as anchors of the future teachers must always come equipped for these challenges charged on them, thus engaging students to learn and develop the potentials needed from them to take part for the betterment of today’s world. Most importantly, future researchers are commended the development of a localized stellarium-based activity will greatly affect the academic performance of the student will surely boost their interest in learning astronomy education.
Meta-Analysis of STEM Education Approach effected on Student’ Creative thinking skills in Thailand
Authors: Monsang P , Srikoon S 
Published: April 2021

Abstract
The objective of this research synthesis is to synthesize research about STEM Education Approach effected on students’ creative thinking skills in Thailand. Period of published research papers from 2010 until 2019 in education field. The related literatures used in this study were chosen from Thai Digital Collection and Thailand Library Integrated system by using the meta-analysis research method. The research tool used was the synthesis record form. Research results can be summarized as follows; They are 10 STEM Education researches, were frequency published in 2017 (80%), the most researchers were female who studied in master degree of Science Education at Rajabhat Mahasarakham University. The most research objectives were about to study and to compare achievement and creative thinking skills of students by using STEM instruction model with Science content. The most research instruments were lesson plans and creative thinking skills measurement form. The most samples were purposive sampling of lower secondary school students with experimental research design. The effect size (d) of research = 0.307 indicating that the STEM instruction model has a positive impact on students’ learning achievement more than control group.
Research synthesis of STEM Education approach effected on students’ problem solving skills in Thailand
Authors: Khamngoen S , Srikoon S 
Published: April 2021

Abstract
STEM education integrates concepts that are usually taught as separate subjects in different classes and emphasizes the application of knowledge to real-life situations. A lesson or unit in a STEM class is typically based around finding a solution to a real-world problem and tends to emphasize problem solving abilty. So, the objective of this research is to synthesize research about STEM Education Approach effected on students’ problem solving skill in Thailand. Variables consisted of a unit of variable which included 17 variables. The collecting data tool is adjusted from the recording data form of the Office of Education Council in Thailand. Data were analyzed by frequency and percentage and were showed the result of STEM Education effected to problem solving skill analysing by one sample t- test, criterion and growth score for content analysis. The results showed that STEM Education Approach effected on students’ problem solving skills in Thailand research dated by 2009-2019 were published mostly in 2017. Naresuan University did the target research highest frequency. Researchers from Curriculum and Instruction, Early Childhood Education, Sciences Education, and Education major mostly produced the research and worked at the Office of the Basic Education Commission. Female reseachers did the more research in STEM Education than male.Thesis in Master degree was done the most comparing with dissertation in Doctoral Degree. Common research objectives mostly focused on “study”. Experimental design was found mostly especially in one group pretest-posttest design. Sampling method was found the most in Purposive sampling. Frequent sample found was students and followed by teachers and expert. Upper secondary level was mostly found in Educational level of sample. The subject area found the most was Physics and followed by Biology. Lesson plans were mostly used in research instruments and analyzing methods mostly used descriptive statistic. The result of STEM Education effected to problem solving skills using one sample t- test found that students’problem solving skills mean score in the post-test were higher than that in the pre-test after learning by STEM Education approach at both the 0.01 and 0.05 level of significance relating to the analyzing method by using mean and standard deviation and growth score.
Factors and Needs Assessment of Hyflex Learning with Science Activity Base For Strengthen Critical Thinking
Authors: Jongmuanwai Benjapuk , Simmatun Pawit , Teemueangsa Sanit , Jedaman Pornchai 
Published: April 2021

Abstract
This article aimed to analyzed the factors of Hyflex learning with science activity base for strengthen critical thinking.This mixed method research on the qualitative research and quantitative research both to participatory action learning. The first to involved synthesizing documentary, interview with 20 teachers, and to collection data by questionnaire with 150 teachers and 150 students. The study revealed that the factors were to instructional using the students base, content transferal of technology to knowledge linking and communication, learning methods to anytime, accessing the technology for opportunity to continuous learning, experience arrangement and environment to diversity. And the needs assessment of Hyflex learning with science activity base for strengthen critical thinking of a level at high levels, The participants showed high needs regarding of students base (PNI Modified=.35) and technology transferal (PNI Modified=.33)
Food for Feeding Red-Whiskered Bulbul (Pycnonotus jocosus Pattani)
Authors: Pangsuban Sasithorn , Thavarorith Wipat 
Published: April 2021

Abstract
Food of an economic bird, Red-whiskered bulbul (Pycnonotus jocosus pattani), was investigated since November 2017 – August 2018 in yala province, Thailand. They were studied by applying survey method. The samples were the red-whiskered bulbul caretakers selected by convenience sampling. Deep Interview and rating scale questionnaires were used as research tools to find the kind of food for most likely tendency by average and percentages. The results showed that 98 percent of samples were male, their education level were undergraduate and lower. The average income was between 10,000 - 30,000 baht. The majority of food which the caretakers used for feeding their pet birds at different ages were the same. They were derived from plants 18 families, including 24 species. The main plants were Kluai Hin (Musa acuminata × balbisiana (ABB Group) ‘Saba’), Kluai Nahm Wa (Musa sapientum Linn.), papaya (Carica papaya L.), water melon (Citrullus lanatus (Thunb.) Matsum. & Nakai), tomato (Solanum lycopersicum L.), cucumber (Cucumis sativus L.), chinese squash (Luffa acutangula (L.) Roxb.) and Tam Lueng (Coccinia grandis (L.) J.Voigt,). Some insect such as mealworm (Tenebrio molitor L.), crickets (Gryllus bimaculatus), some species of grasshopper, and ant eggs were also provided. However, some caretakers mixed some supplements such as vitamins and chili curry into their food for feeding the mature pet bird. Meanwhile, honey and ready-made meals were only used into rearing their chicks.
Assessment of radon and heavy metals in drinking water from some areas of Ra-ngae District, Narathiwat Province, Thailand
Authors: Pisapak P 
Published: April 2021

Abstract
The presence of radon and heavy metals in water is considered as a potential threat to public health. This study aimed to estimate the health risk related to radon concentration and heavy metals in drinking water samples, which taken from in Kalisa sub-district of Ra-ngae district, Narathiwat province. Radon concentration was measured by a solid state nuclear track detector (SSNTD, CR-39). The measured values ranged from 0.17 to 7.63 Bq l−1, which is much below the safe limits proposed by the US Environmental Protection Agency (US EPA) and UN Scientific Committee on the Effects of Atomic Radiation. The mean annual effective dose calculated for these samples was also found to be within the limits provided by WHO and EU council. Three mineral water sources were also analyzed for concentration of certain heavy elements like As, Fe, and, Pb by using inductively coupled plasma-optical emission spectrometer, (ICP-OES). Out of these, concentrations of As were found to exceed the permissible limits suggested by WHO. However, safety limit of national standard for arsenic in drinking water remains at 0.05 mg l−1.
The Optimal Conditions of Saccharification and Fermentation Processes for ethanol production from Bagasse and Economic Feasibility Analysis
Authors: Sukkaew Adulsman 
Published: April 2021

Abstract
Thailand is one of the agricultural countries as a good natural resource like rice, sugarcane. The residue of sugarcane is a Bagasse as the main agricultural products of the sugar industry. Since Thailand is one of the major sugar exporters, it is reported that Thailand produces sugarcane bagasse over 50 million metric tons every year. The objective of this research was to study the optimal condition of saccharification and fermentation Bagasse converted to ethanol production. The research found that 7 days after saccharification and fermentation from Aspergillus and yeast has the highest ethanol content was 12.45±0.43%. While reducing sugar contents 285.65±0.74 g/L. And the results of ethanol concentration from the first and the second distillation were shown as 65.29±0.57% and 92.05±1.24%, respectively. When a study of economic feasibility analysis from selected ethanol condition process has a sensitivity analysis and the payback period is approximately only five months to seven months. In conclusion, the proposed project is attractive for the investors because the current price of ethanol is 18.21 THB per litter and its trend is expected to keep rising. However, if sugarcane bagasse was properly managed, it would be mean to support the robustness and sustainability of the community. It can also reduce agricultural waste and weeds. It can solve the energy crisis as an alternative avenue in the future.
Damage Behavior Prediction of Repaired Composite Laminates Subjected to Oblique Penetrate Loading
Authors: Yang Lingling , Ran Tao , Liu Zhihui , Ren Yiru 
Published: April 2021

Abstract
To predict the effect of oblique impact on the damage and performance of perforation resistance of repaired composite laminates, a three-dimensional continuum damage model (CDM) is used to simulate and calculate the low-velocity impact process of repaired laminates. In the established finite element model, several different types of failure modes are considered. The damage model is based on the modified 3D-Hashin failure criterion to predict the initial damage of the fiber and matrix. The linear-exponential law and the exponential law are used to simulate the tensile and compressive softening process of the material. The triangle traction-separation law and mixed-mode fracture energy method are applied to simulate interface debonding damage between patch/lamina, patch/patch and lamina/lamina. A comparison of the numerical results of several different offsets with the experimental results shows that the simulated failure modes and impact responses are very close to the experiment, which verifies the validation of the finite element model (FEM). The increase of the impact angle can enhance the residual velocity of the projectile in the laminate and reduces the energy absorption. At the same time, it has a great influence on the failure modes, especially the interface debonding damage of the patch.
Experimental Study on Dynamic Tensile Properties and Ballistic Performance of Different Armor Materials
Authors: Wu Hailing , Miao Cheng , Bai Lihong , Niu Haiyan , Zhong Tao , Lu Ruijiao , Yang Zizhen , Guo Yiyan 
Published: April 2021

Abstract
Hopkinson bar system was used to test the dynamic tensile properties of high nitrogen steel, 685 armor steel, 603 armor steel and 316 stainless steel by adjusting loading pressure, the strain rate and dynamic tensile strength of different armor materials were obtained. Under the experimental conditions in this paper, the dynamic tensile strength of the high-nitrogen steel is 1883 MPa which is the maximum of the four materials. At the same time, by using 12.7 mm armor-piercing projectiles, the ballistic tests of semi-infinite targets of different armor materials were carried out. Penetration depth of high-nitrogen steel is 25.5 mm which is the smallest of the four materials. The standard penetration depths of armor materials decrease with the increase of dynamic tensile strengths, and tensile strength increases under the test conditions in this paper. Therefore, the material with high dynamic tensile strength should be selected as the ballistic component in armor design.
Adiabatic Shearing Behavior of Shock-Prestrained Ti-2Al-9.2Mo-2Fe Alloy at Different Reloading Strain Rates
Authors: Ji Jianping , Li Zheng , Ren Yu , Tan Chengwen 
Published: April 2021

Abstract
The effect of shock-prestrain on the adiabatic shearing behavior of a metastable β titanium alloy, Ti-2Al-9.2Mo-2Fe (2A2F), is systematically investigated. 2A2F alloy blocks with average grain size of 67 μm were first shock-prestrained at 6 and 12 GPa, and then reloaded at strain rates of 3000 and 4000 s−1. The results show that, the dynamic strength of 2A2F hardly increases after the shock prestrain. Adiabatic shear bands (ASBs) are more likely to bifurcate and interact, and the density of micro-damages and micro cracks in ASBs increases in the shock-prestrained materials. This trend becomes more significant with the increased preshock stress amplitude. However, in general, the amount of ASBs is low regardless of shock stress amplitude. The dynamic ductility is also hardly affected by shock-prestrain. These suggest that 2A2F alloy has good resistance to multiple impacts.
Study on the Penetration Performance of Micro-shaped Charge with Different Liner Materials
Authors: Han Yangyang , Yin Jianping , Cui Hailin , Bi Guangjian , Duan Conghui , Zhang Yu , Li Hao , Qi Jiawen 
Published: April 2021

Abstract
In order to study the damage performance of micro-shaped charge with different materials, the AUTODYN finite element software was used to simulate the formation process of damage element and the penetration performance of micro-shaped charge to target when the liner material was copper, Teflon and nylon. The results show that although the head velocity of the damage element formed by the copper liner is the smallest, the penetration depth to the target is the deepest, and that of the nylon liner is the largest, but the penetration depth to the target plate is the smallest. The head velocity of the damage element formed by the Teflon material liner and the penetration depth to the target are between the two.
Study on Performances of Novel Anti-Detonation Composites
Authors: Wang Jinhua , Shi Xiumei , Wang Qiang , Zheng Yangsheng , Zhang Lijun , Cheng Yingye , Zhang Le 
Published: April 2021

Abstract
From the optimized wave-absorbed layer aspect, a new light weight anti-detonation composite structure composed of armor steel, Aluminum foam, ceramic, aramide fibers and rubber materials is produced, and detonation tests with 50 g RDX, 6 kg-TNT, 8 kg-TNT, 10 kg-TNT charge were carried out on it. The results show that new anti-detonation composite has the advantages of reducing blast peak value, prolonging the action time for shock wave and absorbing wave to decrease blasting energy. The anti-detonation composite component has high bearing strength and tensile strength; after the detonation test, there is no penetrated destruction and large deformation on the backing plate, which satisfies the NATO protection Standard level two and level three.
Effect of Coupling of Eletropulsing Treatment and Ultrasonic Surface Modification on the Surface Nanostructure Layer of Steel
Authors: Shen Yalin , Liu Dan , Tang Pengbo , Liu Jie , Zhang Shiming , Li Yong , Yan Fangjun 
Published: April 2021

Abstract
A coupling of eletropulsing treatment and ultrasonic surface modification (C-E-U) was employed to design the nanostructured layer materials with high strength and surface protection of 40Cr17Mo steels. The surface properties of the specimens after dry cutting, coupling of ultrasonic-eletropulsing treatment (CUE) and coupling of eletropulsing-ultrasonic treatment (CEU) were characterized, respectively. A grain refinement layer was formed on the specimen’s surface after the coupling of eletropulsing treatment and ultrasonic surface modification. The residual stress on the top surface was reduced. This is caused mainly by two aspects: one is the aggregation of subgrain boundaries during deformation in order to form new grain boundaries processed by the ultrasonic effect; the other is that the acceleration effect of electropulsing. Moreover, it was found out that electropulsing is very effective to release residual stress in the material surface.
Structure and Power Design of 80 mm Warhead
Authors: Duan Conghui , Yin Jianping , Qi Jiawen , Bi Guangjian 
Published: April 2021

Abstract
This paper mainly conducts numerical simulation and analysis of the warhead structure of 80 mm assault ammunition, which needs to realize the effective penetration of 400 mm into the C35 concrete target and carry out the killing of incoming bullets. Before the first level of warhead design: effective penetration level before the warheads main function is to 400 mm C35 concrete goals, to achieve tactical technique index by shaped charge, bar type jet formation, medicine type cover adopt ball is short of cover, material is copper, medicine cover type choose such as wall thickness, and wall thickness of 2.52 mm, dynamite to choose B, using Ls-Dyna software simulation. The results show that the structure design has good jet forming, which can easily penetrate the 400 mm C35 concrete target plate, and the opening diameter is more than 20 mm. Through the hole opening diameter of the front rank warhead, it is finally determined that the diameter of the incoming bullet is 20 mm and the killing force is effective.
Interlayer Material Interactions on Shaped Charge Jet Protection Performance of Passive Armor
Authors: Liu Yang , Li Rujiang , Zhou Pengfei 
Published: April 2021

Abstract
The process of jet interaction with oblique highly passive armor was analyzed, and the relations on energy absorbed by the interlayer material of inert cassette were presented. The bulging armors with silicon rubber and plexiglass interlayer material interacted with shaped charge jets were studied experimentally. When the jet parameters is determined, the energy deposited in the interlayer during shaped charge jet penetration is related with not only its physical dimension, such as obliquity and thickness, but also with other physical parameters, such as material density, sound velocity and material strength, et al. the shaped charge jet penetrating capability decrease 75% and 65% respectively when passed through the silicon rubber and plexiglass composite armor, which shows that the silicon rubber cassette have better protection performance.
Numerical Simulation of Wedge-shaped Multi-sandwich Reactive Armor Interfering with Shaped Jet
Authors: Hou Jiahao , Zhou Tong 
Published: April 2021

Abstract
In order to obtain the explosive reaction armor with better interference capability to jet, a king of wedge-shaped multi-sandwich explosive reaction armor was designed on the basis of the existing wedge-shaped and flat structure explosion reaction armor. ANSYS/LSDYNA was used to simulate the interference process of the wedge-shaped multi-sandwich reaction armor on jet. Focusing on the research on the interference effects of four kinds of explosive reactive armors on jet penetration at 0° and 68°, it is found that one of the new explosive reactive armors has better jet interference effect than the other three explosive reactive armors at the impact angle of 0°. And the new explosive reactive armor is obviously best than other explosive reaction armors when jet penetrate at an angle of 68°. Finally, the relationship between the interference effect of explosive reactive armors on jet and the penetration angle of the jet was studied.