Miracle-dz/UniFAR-FTUs huggingface dataset:
Variation Law and Experimental Study on Multi-stage Critical Speed of an Aero-engine Power Turbine Rotor

Finite element method was used to establish the calculation model of the dynamic characteristics of the simulated power turbine rotor, and the dynamic characteristics of the rotor were systematically calculated and analysed. The variation law of the first three stages critical speeds of the rotor with the supporting stiffness and the mass of each disk were revealed. The dynamic characteristics test of the simulated power turbine rotor in the full speed range was completed, and the calculation results and test results were compared and analysed. The results show that the calculation model reflects the dynamic characteristics of the rotor well, and the rationality of the rotor structure design, supporting layout and critical speed distribution were verified. The study provides a theoretical basis for the adjustment of critical speed based on the supporting stiffness and disk’s mass, it also provides technical reference for the real rotor structure design and test.
Efforts to improve students’ mathematical critical thinking ability by using Team Assisted Individualization learning model

The development of critical thinking is the goal of the Indonesian education curriculum. However, research on how to develop and improve these abilities is still rarely studied. In this article, we offer a team assisted individualization-learning model in improving critical thinking skills. The objectives of this study were (1) to describe the improvement of students’ mathematical-critical thinking skills using the Team Assisted Individualization learning model, (2) To determine the increase in students’ critical thinking skills after team assisted individualization learning has carried out. This study used experimental research. The subjects in this study were fourth-semester students of the Khairun University mathematics education program. The instrument used was a question describing students’ mathematical-critical thinking skills. Data have been analyzed per indicator and as a whole using descriptive analysis, namely benchmark reference guidelines (PAP) scale five and Normalized Gein. Data were analyzed using the inferential analysis to determine the increase in students’ mathematical critical thinking skills, namely hypothesis testing (one-sample t-test). The result of the data analysis showed an increase in students’ mathematical critical thinking skills, which were interpreted moderately after implementing the assisted individualization team learning model.
The impact of external knowledge on organization performance with indirect effect of instructional agility and process innovation effectiveness

Engaging industry in Vocational High School (VHS) policy outcomes does not only offer awareness of market needs, but also enables industries to influence learning and teaching methods and courses across the overall VHS. This study indicates that external knowledge leads to the feasibility of instructional agility, and process innovation effectiveness, resulting in success of VHS. This study looks at structural equation modeling (SEM) analysis based on empirical data obtained from 129 vocational high schools in Bali Province, Indonesia. The study aimed to concentrate explicitly on how the impact of external knowledge on VHS achievements in Indonesia is mediated by instructional agility, and process innovation effectiveness. The study shows that external knowledge has no influence on VHS performance, while improving VHS performance indirectly through all instructional agility and effectiveness of process innovation.
Changes in seagrass carbon stock: implications of decreasing area and percentage cover of seagrass beds in Barranglompo Island, Spermonde archipelago, South Sulawesi, Indonesia

Seagrass ecosystems in shallow waters, including in highly dense small islands, are vulnerable to anthropogenic activities and may lead to a decreasing in seagrass area and percentage cover. As a result, it will negatively affect climate change mitigation, i.e. a decrease in seagrass carbon stock. This research was conducted to evaluate seagrass carbon stock changes in Barranglompo Island, Spermonde archipelago, in 2001 and 2017. Carbon stock estimation was carried out by collecting seagrass biomass based on the category of a sparse, medium, and dense seagrass coverage (each with 20 replications) and analysing their carbon concentrations. Changes in carbon sequestration were analysed using an estimated approach to the changes in the seagrass bed areas. Landsat and Worldview-2 image analysis were utilized to estimate the area of seagrass beds in 2001 and 2017, respectively. Results showed a decrease in seagrass beds by 9.9 ha, from 66.8 ha in 2001 to 56.9 ha in 2017, or an average of 0.62 ha per year. Based on that, it was estimated that seagrass carbon stocks had declined from 74.19 tons in 2001 to 65.21 tons in 2017 or decreased by an average of 0.75% per year. Anthropogenic activities, such as boat anchors as well as household waste disposal in the seagrass area, are considered having the potential in causing a decrease in seagrass area and the percentage coverage.
Student-centered learning models and learning outcomes: meta-analysis and effect sizes on the students’ thesis

A meta-analysis of students’ thesis is very necessary to improve the quality of research in maintaining the consistency and scientific truth justification of the theory. This study aims to (i) obtain an effect-size estimation, which is the strength of the relationship between the variables studied in a quasi-experimental study; (ii) describe the effectiveness of student-centered learning models compared to teacher-centered learning on learning outcomes; (iii) describe the conditions that affect the effectiveness of the student-centered learning models in the final assignments of students of Informatics Engineering, Universitas Pendidikan Ganesha. In order to achieve this goal, 22 students’ final assignments were reviewed as research samples. The study focused on two things, namely, (a) calculating the effect size of each sample of the theses; (b) examining the theoretical and empirical justification used to discuss the acceptance of the hypothesis. Statistical analysis techniques were used to determine the value of the effect size. The results showed, the effect-size value for the entire sample was 1.109 in the high category. Then, the results of the study of the t value for all the thesis studied showed all t-count values were greater than t-table values at a significant level of 0.05. It means student-centered learning models are better than teacher-centered learning models on the learning outcome variables studied.
Quality control of cardboard using MEWMA and MEWMV control chart (case study in PT. Y Kediri Indonesia)

Cardboard is one type of paper that has a grammatic value above 200 g/m2. Controlling the quality of competing products is important to improve product competitiveness. The purpose of this study was to analyze carboard quality and provide improvements at PT. Y Kediri East Java. The research methods used were MEWMA (Multivariate Exponentially Weighted Moving Average) and MEWMV (Multivariate Exponentially Weighted Moving Variance). The data used were nine variables of quality of cardboard, that were grammage, thickness, pull resistance, PS surface smoothness, BS surface smoothness, print surface smoothness, oil print, PS color, and BS color, with a time span between 2016 and 2018. Data were taken for ICB 230, ICB 210, WHI 230 and ICB 250 type of cardboard. From the MEWMV control chart, the types of ICB 230, ICB 210, WHI 230, and ICB 250 successively have out-of-control points of 19, 10, 6, and 5, while in the MEWMA control, types of ICB 230, ICB 230, ICB 210, WHI 230, and ICB 250 respectively have out of control points of 13, 9, 9, and 6. The main causes of product defects were repeated machine configurations and uneven spraying of pulp, and dew dripping over the production machine. In addition, other causes were adhesives and coating materials which were too thick/runny, and materials which were not suitable for production enter the process. Some suggestions for improvement that can be done are placing filters at the entrance of the coating material, and adjusting the temperature of the production machine’s environment.
Study in the Changes on the Functional Groups Present in Biomass during Pyrolysis Process

In this study, investigate the changes occurs on the functional groups of biochar materials. The biomass materials subjected to the pyrolysis, which is a thermochemical conversion process to obtain biochar material. It was produced by slow-pyrolysis method by subjected in different pyrolysis temperatures (400, 600, 800 and 1000°C). Effect of the treatment procedures was determined by the modifications in the functional groups of the obtained bio-char during the pyrolysis treatment was determined with the Fourier transform infrared spectroscopy (FT-IR). FTIR methods deliver fast, low-cost and non-destructive analysis and have shown qualitative and quantitative outcomes. The analysis was applied to some agricultural biomass materials such as saw dust, rice hull, wheat hull, tea wastes, and eucalyptus shell. Results are associated with literature, and species potentially computable by Fourier Transform Infrared Spectroscopy are reviewed. The result showed that the aliphatic, hydroxyl and aromatic groups gradually diminishes by increasing the temperature from 400 to 1000°C.
Assessment of Long-Term Compost Application on Physical, Chemical, and Biological Properties, as Well as Fertility, of Soil in a Field Subjected to Double Cropping

The aim of this article was to assess the influence of long-term application of compost on the physical, chemical, and biological properties, as well as the fertility, of soil in a field subjected to double cropping (paddy rice and barley), mainly by integrating previous studies of the effects of compost and manure on soil qualities. Continuous compost application, especially at a high level (30 Mg·ha-1·y-1), into the double cropping soils increased the activities of organic C-, N-, and P-decomposing enzymes and the contents of organic C, total N, and microbial biomass N, as well as the cation exchange capacity, thereby contributing to the enhancement of soil fertility. Also, the compost application increased the degree of water-stable soil macroaggregation (>0.25 mm), which was correlated significantly (r > 0.950, p < 0.05) with the contents of hydrolyzable carbohydrates (with negative charge) and active Al (with positive charge), and resulted in the modification of soil physical properties. Furthermore, the application increased the amount of soil organic matter, including humic acid with a low degree of darkening and fulvic acid, and contributed to C sequestration and storage. Physical fractionation of soil indicated that about 60% of soil organic C was distributed in the silt-sized (2 - 20 μm) aggregate and clay-sized (<2 μm) aggregate fractions, while about 30% existed in the decayed plant fractions (53 - 2000 μm). The results obtained unambiguously indicate that long-term application of compost can improve soil qualities in the field subjected to double cropping, depending on the amount applied.
Electrolyte Leakage as an Indicator of High-temperature Injury to Harvested Mature Green Tomatoes

Newly harvested tomatoes are often exposed to short periods of high temperatures. To simulate harvest conditions, mature green (MG) tomatoes (Lycopersicon esculentum Mill., cv. 908) were exposed to direct solar radiation until their mean temperatures became 45°, 50°, or 55°C. When fruit temperatures were > 50°, heat injury was obvious. Once exposed, tomatoes remained at these high temperatures for ≈ 1 hr, even after being transferred to shade. The interaction between high temperature and exposure time on tomato thermostability was studied in the laboratory. MG ‘908’ tomatoes were exposed to temperatures ranging from 25° to 65° for 30 to 180 min; the damage was then measured by determining the amount of electrolyte leakage. A mathematical model describing the interaction of temperature and time was used to predict the critical high temperature and exposure time. Critical exposure times calculated for ‘908’ tomatoes were 34, 105, and 166 min for exposure to 55°, 50°, and 45°, respectively. For practical field applications, this high-temperature stress may decrease the quality by causing the destruction of fruit cellular tissue and physiological disorders.
Efficient Method for Storing Health Record in Cloud Using Integrity Auditing and Data Sharing

Identity based cloud storage authorization is proposed in this paper to provide protection of cloud data. Many sensitive information is stored in the cloud, and it must be kept safe from unauthorized access. By hiding the sensitive information’s, privacy for an individual or organization is provided. The data in the cloud are secured by hiding the sensitive information. In the proposed system when the user and data analyzer sign-in they will receive the verification mail to assure as a valid user or data analyzer. The verification key for the user and the data analyzer is generated by the Private Key Generator (PKG). The user and the data analyzer enter the cloud using the verification key to upload and retrieve data from the cloud. Until uploading data to the cloud, the user encrypts the data, concealing confidential details. The Third Party Auditor is in charge of the cloud auditing process (TPA). This scheme allows data files stored in the cloud to be shared and used by data analyzers under the condition that confidential information is hidden, allowing the auditing system to operate more efficiently.
Characterization of used oil distillate at various distillation temperatures as diesel fuel

Used oil is a hazardous and toxic waste. When this waste is disposed off into the environment, it harms the environmental. The conversion of used oil to diesel fuel candidates has been studied utilizing a simple distillation method. The distillation is carried out on used oil with a zeolite catalyst placed on a distillation tower. Distillation temperature variations of 360 °C, 380 °C, 400 °C are applied to used oil to produce fuel distillates. Tests were carried out on distillates in flashpoints using ASTM D93, Kinematic Viscosity using ASTM D445 and Cetane Index using ASTM D4737. The results of the calculated cetane index test showed the respective values of 48.44, 48.46 and 48.84. The viscosity at 40°C (mm 2sec) resulted in 1.57, 1.64, and 2.00. While the flashpoint value shows the number 27°C, the temperature variation does not affect the flashpoint value. The results of this test, when compared with Dirjen Migas Specification, the flashpoint value has not been fulfilled although with the addition of NaOH. A distillation temperature of 400°C only fulfils the minimum kinetic viscosity. In contrast, the Calculated cetane index has been fulfilled, with the largest value generated at a distillation temperature of 400°C.
Grassland-to-cropland conversion increased soil, nutrient, and carbon losses in the US Midwest between 2008 and 2016

After decades of declining cropland area, the United States (US) experienced a reversal in land use/land cover change in recent years, with substantial grassland conversion to cropland in the US Midwest. Although previous studies estimated soil carbon (C) loss due to cropland expansion, other important environmental indicators, such as soil erosion and nutrient loss, remain largely unquantified. Here, we simulated the environmental impacts from the conversion of grassland to corn and soybeans for 12 US Midwestern states using the EPIC (Environmental Policy Integrated Climate) model. Between 2008 and 2016, over 2 Mha of grassland were converted to crop production in these states, with much less cropland concomitantly abandoned or retired from production. The net grassland-cropland conversion increased annual soil erosion by 7.9%, nitrogen (N) loss by 3.7%, and soil organic carbon loss by 5.6% relative to that of existing cropland, despite an associated increase in cropland area of only 2.5%. Notably, the above estimates represent the scenario of converting unmanaged grassland to tilled corn and soybeans, and impacts varied depending upon crop type and tillage regime. Corn and soybeans are dominant biofuel feedstocks, yet the grassland conversion and subsequent environmental impacts simulated in this study are likely not attributable solely to biofuel-driven land use change since other factors also contribute to corn and soybean prices and land use decisions. Nevertheless, our results suggest grassland conversion in the Upper Midwest has resulted in substantial degradation of soil quality, with implications for air and water quality as well. Additional conservation measures are likely necessary to counterbalance the impacts, particularly in areas with high rates of grassland conversion (e.g. the Dakotas, southern Iowa).
A novel and Rapid Method for Detecting Bio-fungicide Properties in Plant Species

Searching for eco- friendly bio-fungicides have become promising strategy to confront the resistance phenomenon against synthetic fungicides in pathogenic fungi. Unlike the previously described techniques to survey the plants for their secondary toxic metabolites against fungi, a novel technique reported here. The new technique designing on using a detached leaf bioassay and inoculum of Macrophomina phaseolina, the charcoal rot pathogen of sesame. Of an eleven different plant species belong to different families examined with this technique only one species (Giradol, Chrozophora tinctoria of Euphorbiaceae) showed no response to Macrophomina phaseolina inoculation on detached leaf even with wounding. The aseptic aqueously extracted leaf of the Giradol inhibited the growth of the Macrophomina phaseolina by 90% on potato dextrose agar media. This technique is relatively easy, fast and enabling to evaluate for bio- fungicidal existence in several species of plant at the same time.
Single Isomer of Indene-C70 Bisadduct—Isolation and Performance in Bulk Heterojunction Solar Cells

Indene-C70 bisadduct (IC70BA) is a high performance electron acceptor material consisting of a mixture of regioisomers. A single isomer of the IC70BA was isolated by careful chromatographic separation. The structure of this isomer was confirmed by various analytical techniques including single crystal X-ray analysis. The isomer showed superior performance to other isomer mixtures of IC70BA in bulk heterojunction solar cells using poly(3-hexylthiophene) as the donor material.
Retraction Retraction: Comparative analysis of CNN and Viola-Jones for face

According to the World Health Organization, the Coronavirus (COVID-19) pandemic is causing a worldwide emergency, and one safe way to cover oneself is to wear masks. This pandemic constrained governments everywhere in the world to force lock-downs to avoid the transmission of infection. Reports show that wearing masks at work diminishes the danger of infection. We assemble our model by utilizing the concept of deep neural learning and AI. The dataset comprises pictures with masked faces and non-masked faces. Several computer algorithms are there for face detection. But this analysis centers around two of the most widely recognized procedures: The Viola-Jones algorithm and the Convolution Neural Networks. We will check whether the individual in the image/video wears a mask or not with a CV and Deep neural learning. Not only finding out about face mask detection, but this project also introduced the chance to delve into the field of computer algorithms.
Latitudinal Distribution of Ethane Precipitation on Titan Modulated by Topography and Orbital Forcing and Its Implication for Titan’s Surface Evolution

A general circulation model with geography constrained by Cassini is used to predict how ethane precipitation in Titan’s lower stratosphere varies with latitude, season, and orbital forcing over the past 100 kyr. Ethane precipitation is generally more prevalent near the winter pole, where stratospheric ethane is transported downward toward the cold trap, and this general pattern is relatively insensitive to orbital parameter variations and geography. However, eccentricity-driven seasonal temperature variations modulate the seasonal asymmetry of ethane precipitation to some extent. The annual ethane precipitation does not monotonically increase from equator to pole but maximizes at selected sites, preferentially over empty deep basins such as Hagal Planitia. Local enhancement of ethane precipitation is caused by katabatic winds from plateau to basin and an associated regional-scale thermally direct circulation over the slope, which induces strong adiabatic cooling near the tropopause. The observed putative ethane clouds off the poles are evidence that ethane condensation is affected by topography. Preferential ethane precipitation over basins may increase the irregularity of Titan’s shape by isostatic crustal subsidence after substitution of enclathrated methane by percolated ethane.
Influence of geometric deviations of the fan blade airfoil on aerodynamic and mechanical integrity

A technology for robust multi-criteria optimization of the fan blades with real deviations of airfoil geometry is proposed which includes simultaneously solving aerodynamic and mechanical integrity problems as well as balancing and arranging the blades in the row. In accordance with this technology, automated measurements of blades airfoil geometry (more than 1200 points) are used to automatically create a blade “cold” 3D model, meshing, and static and dynamic analysis of mechanical integrity. Then the model and mesh are automatically transformed in a “hot” condition and an aerodynamic analysis is carried out to estimate the measured geometry influence on fan parameters. Finally, arrangement of blades in the row is carried out based on static moments and aerodynamics analysis. The final stages of this technology are presented in this paper more detail.
The exploration of ethnomathematics based on Rapa’i Geleng dance as mathematics learning media

Several abstract topics in mathematics are considered unrelated to contextual problems. This condition occurs because students cannot use some abstract mathematics topics which obtained at school in their daily activities. Hence, students are less interested in mathematics learning. Therefore, a bridge connecting formal school mathematics and the local culture is needed; one of them is ethnomathematics research method design. Ethnomathematics is a qualitative method design which examines the practice and elements of mathematics in a cultural group. One of the cultures which grows, develops, and is popular in Banda Aceh City is the Rapa’i Geleng dance. Rapa’i Geleng is a traditional Acehnese dance performed by shaking the head to the left and right regularly in a specific pattern following the rhythmic strains of the Acehnese traditional musical instrument called Rapa’i. The data were collected through document review, including videos, photos, notes, and interviews with experts. The results of the exploration show that there is a mathematical concept in the Rapa’i Geleng dance, namely number pattern. The sequence topic was observed from dancers’ regular movement based on their position. Consequently, this dance is supposed to be used as a learning medium to explain abstract mathematical concepts to the students.
On Undecidability of Subset Theory for Some Monoids

Early we (with B. N. Karlov) have proved the following claim for the infinite cyclic monoid ℋ. Let exp ℋ be an algebra of finite subsets of ℋ with the same operation, exp ℋ must be a monoid again. So the theory of exp ℋ is equivalent to elementary arithmetic. Thus, the theory of the monoid exp ℋ is undecidable. Here we consider an arbitrary commutative cancellative monoid ℋ with an element of infinite order, and generalize the previous claims to the corresponding monoid exp ℋ.