bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asteroseismology of 16 Kepler Solar-like Stars: Stellar Parameters and the Effects of Element Diffusion
Authors: Wang Shuai , Zhang Qian-Sheng 
Published: May 2023

Abstract
Element diffusion has small but significant effects on the structure of the stellar interior. It is interesting to investigate the effects of element diffusion using asteroseismology. We have constructed two grids of stellar models, one with diffusion and one without, for solar-like stars with masses between 0.9 and 1.4 solar masses, and varied initial helium abundance and metallicity. The oscillation frequencies of all stellar models have also been calculated. Piecewise Hermite cubic polynomials are adopted to interpolate stellar p-mode frequencies at an arbitrary age on a stellar evolutionary track. We have investigated 16 Kepler solar-like stars by comparing the model frequencies with observations. The suggested ranges of stellar parameters and some global variables are obtained. For all stars, the best model reproduces the observational frequencies with a χ
2 of the order of unity. It has been found that element diffusion is important in modeling solar-like stars. Without diffusion, the best value of the initial helium abundance is below the primordial helium abundance from Big Bang nucleosynthesis. When diffusion is taken into account, the required initial helium abundance increases to be higher than the primordial abundance. Diffusion also generally improves the frequency fitting results by reducing the minimum of χ
2. Investigation of the second difference of the oscillation frequencies on KIC 8694723 and KIC 10454113 indicates that the current model of element diffusion may underestimate the strength of settling.
Possible Detection of a Flare-associated Coronal Mass Ejection on an M-dwarf
Authors: Wang J. 
Published: May 2023

Abstract
We here report a probable detection of a stellar coronal mass ejection (CME) in active M dwarf KIC 8093473 by performing an analysis on its time resolved X-ray spectra observed by the XMM-Newton satellite. Compared to the value at the quiescent state and the interstellar one, our spectral modeling returns a marginal (and probably evolving) excess of hydrogen column density in the flare state at a significance level of 1σ, which can be understood by an additional absorption due to a flare-associate CME. The CME mass is then estimated to be ∼7 × 1018–2 × 1020 g according to the ice cream cone model.
A Catalog of Collected Debris Disks: Properties, Classifications and Correlations between Disks and Stars/Planets
Authors: Cao Peng-Cheng , Liu Qiong , Liao Neng-Hui , Yang Qian-Cheng , Huang Dong 
Published: May 2023

Abstract
We have collected a catalog of 1095 debris disks with properties and classification (resolved, planet, gas) information. From the catalog, we defined a less biased sample with 612 objects and presented the distributions of their stellar and disk properties to search for correlations between disks and stars. We found debris disks were widely distributed from B to M-type stars while planets were mostly found around solar-type stars, gases were easier to detect around early-type stars and resolved disks were mostly distributed from A to G-type stars. The fractional luminosity dropped off with stellar age and planets were mostly found around old stars while gas-detected disks were much younger. The dust temperature of both one-belt systems and cold components in two-belt systems increased with distance while decreasing with stellar age. In addition, we defined a less biased planet sample with 211 stars with debris disks but no planets and 35 stars with debris disks and planets and found the stars with debris disks and planets had higher metallicities than stars with debris disks but no planets. Among the 35 stars with debris disks and planets, we found the stars with disks and cool Jupiters were widely distributed with age from 10 Myr to 10 Gyr and metallicity from −1.56 to 0.28 while the other three groups tended to be old (>4Gyr) and metal-rich (>−0.3). In addition, the eccentricities of cool Jupiters are distributed from 0 to 0.932, wider than the other three types of planets (<0.3).
CNC drilling and comparative investigation on machinability of novel epoxy composite
Authors: Suneel Kumar M , Satish Kumar D 
Published: May 2023

AbstractTo investigate the rate of material removal (MRR) of CNC machined (drilling) epoxy based novel hybrid composite included with synthetic glass, natural banana fibers and carbon particles. The samples of both the groups under investigation were made by conventional hand-lay technique. Samples were prepared as per standards and machining (drilling) is performed using a vertical milling CNC machine. The rate of material removal of the samples was investigated and compared between the groups by doing 9 experiments per group and also repeated once, and accordingly 18 experiments per group. Independent t tests were performed using SPSS statistical software tool for investigating the rate of material removal. The observations made on results, Group-1 comprising plain epoxy (PE) displays an average of 4.38 mm3/sec, while Group-2 encompassing of carbon particles (Cp) (5 wt.%)/Banana fiber (BF) (5 wt.%)/glass fiber (GF) (15 wt. %)/epoxy (75 wt. %) showed an average of 5.54 mm3/sec. The statistical analysis of the T-test reveals that there is a significant (P0.05) variation of MRR amid Group-1 and Group-2. This finding is based on the fact that there is a change in the mean variance of MRR. It is clearly understood that the inclusion of BF and Cp along with GF have significant influence on the improvement in MRR.
Compression strength analysis of glass fibre polymer composites filled with brown algae powder compared to glass fibre reinforced polymer composite
Authors: Nikhil Chakravarthi K , Madhu S. 
Published: May 2023

Abstract
The current investigation intends to compare the compression strength analysis of glass fiber composites filled with brown algae filler. The material involved in this work is a glass fibre composite filled with and without brown algae filler. 40 specimens were tested by using selected parameters using the universal testing machine. In this work, the control group was a glass fiber epoxy composite and the experimental group was a brown algae-filled glass fiber-reinforced polymer. The mean compressive strength obtained for the brown algae-filled glass fibre reinforced polymer is, whereas it is for the Glass fibre reinforced polymer with the significant value is 0.018 (p<0.05). Within the scope of this investigation, experimental data reveals that strength in compression is high when the glass fiber-reinforced composite is filled with brown algae powder.
A comparative study on graft copolymerization of MMA onto wood fiber under microwave and conventional heating
Authors: Ko R V K , Soon K H , Siddique B M , Jayamani E , Lee X Y , Palanisamy S 
Published: May 2023

Abstract
Wood polymer composites (WPC) are gaining popularity and widespread usage due to an increased awareness of human population towards the importance of environmental effects and green eco-friendly materials. Mechanical properties of WPC could be improved through graft copolymerization of monomer onto wood fiber to improve interfacial bonding. In this study, a comparison of free radical graft copolymerization using microwave-assisted and conventional heating method was performed. Methyl methacrylate (MMA) monomer is used in graft copolymerization of Meranti wood using a free radical initiator system consisting of ferrous sulfate and hydrogen peroxide. Grafting reaction time was varied while other graft parameters were kept constant including monomer concentration, initiator molar ratio, reaction temperature and solvent volume. Maximum graft yield of 11.75% and 10.17% were obtained for water bath heated and microwave-assisted method respectively. The presence of grafted monomer was proven by FTIR spectra analysis. Thermogravimetric analysis performed on grafted wood fibers showed improved thermal resistance compared to ungrafted wood fiber.
Effect of binary and ternary blending of cement on properties of recycled aggregate concrete
Authors: Nayak M , Shukla A , Vaishnav S K 
Published: May 2023

Abstract
Escalating the growth of industrialization and urbanization in the world demands the development of advanced infrastructure which in turn required a higher quality of raw materials. As cement is one of the major raw materials in concrete construction its demand for rising with the development of society. But the increased production of cement produces lots of environmental problems. So, there is a high requirement for a sustainable alternative of cement that have similar cementitious properties as cement. To address this problem experimental study is designed to use the binary blending of cement with rice husk ash (5%, 10%, 15% and 20%) as a replacement for cement. The study is further extended to analyse the effect of ternary blending of cement using further (5%, 10% and 15%) replacement of cement by sugarcane bagasse in optimum binary blended combination. Also, 25% of recycled fine aggregate is used in experiment as fine aggregate replacement throughout the mixes to achieve sustainability. Workability, compressive strength and flexural strength test were performed on concrete sample. The result of the study reveals that the workability of concrete mixes decreases with increases in the percentage of replacement both in binary and ternary mixes. In binary blending optimum strength is achieved at 15% replacement of cement with rice husk ash whereas in ternary blending 10% replacement by sugarcane bagasse ash with 15% rice hush ash was found optimum. Further, concrete shows 17.7% increase in compressive strength and 16% increase in flexural strength under the permissible value of workability. Study concluded that binary blending improve strength property and ternary blending further improve strength of concrete resulting in sustainability in construction.
Prediction of mechanical strength of magnesium alloy AZ31 with calcium addition using a neural network based model
Authors: Thamarai Selvan A. , Palani S. 
Published: May 2023

Abstract
The aim of the research is to develop a neural network model to predict the mechanical strength of AZ31 magnesium alloy in addition with Calcium. This would help researchers or academicians to fabricate the magnesium alloy AZ31+x wt. % Ca which finds more importance in making biodegradable implants in orthopedic surgery. As the yield strength of human bone lies between 104.9 – 114.3 MPa whereas for pure Mg it is very lesser, it is needed to make alloys suitable for biomedical applications which are to be satisfied with their mechanical properties and biocompatibility. An artificial neural network-based model is used to predict the mechanical properties of Mg alloys AZ31+x wt. % Ca with compositions of Al, Zn, Mn and Ca as countable parts with various proportions. The compositions and properties of twenty different as cast alloys were used for training and prediction of the desired mechanical properties using Artificial Neural Network and the outputs are compared with the experimental results. The results show that the Levenberg-Marquardt (LM) algorithm serves better in prediction of mechanical properties of Mg alloys AZ31 and AZ31+1 wt. % Ca. Also the results were found significant at 90%, 95% and 99% confidence limits.
Slake durability index (SDI) of weathered Deccan trap basalt
Authors: Shrivastava Gunjan , Jain Gaurav , Namdev Vidur 
Published: May 2023

Abstract
The slake-durability test is considered to be a basic method for determining the degree to which a rock is susceptible to the effects of the weather. The results of this experiment shed light on the processes that take place when rocks are exposed to the elements at varying depths or even on the surface of the earth. During the slake-durability tests, Franklin and Chandra said that ion exchange and capillary tension are applied to the mechanisms. A total of ten rock samples gathered from a variety of locations were subjected to slake durability testing in order to ascertain the degree to which the Deccan trap basalt is susceptible to the elements in the vicinity of Indore (Madhya Pradesh). It is possible that the dry operation will only take forty-five minutes to complete for some basalt rocks, namely the surface region of the basalt samples.
Experimental study of corrosion inhibition of RCC element using glass FRP mats
Authors: Namdev Vidur , Jain Gaurav 
Published: May 2023

Abstract
The corrosion of steel reinforced bars has been the main cause of affecting the strength of structural elements. An investigation on corrosion inducement at large scale on reinforced concrete beams by impressed current technique and their strengthening using Glass Fibre Reinforced polymer sheets. 5 Beams (1 uncovered + 4 covered with GFRP mats having different patterns) have been provided an accelerated environment to corrode, then tested to structural failure. The accelerated corrosion has been performed by dipping the beam into 5% NaCl solution upto half depth so as to target only the bottom rebar. The cathode has been fixed in the tub along with the beam as anode. An external power supply has been provided to supply a constant voltage of 15 V. One beam of each pattern and one controlled beam have been subjected to accelerated corrosion regime. After 150 hours of accelerated corrosion the beams have been subjected to Rebound hammer and Ultrasonic pulse velocity test i.e. non-destructive testing. After this beams have been subjected to Destructive testing like centre-point load flexure test. The decrease in area of steel reinforcement has been calculated using Faraday’s Law. Since the presence of Chloride ions in de-icing salts is the major cause the breakdown of the passive layer which is responsible to initiate corrosion. It only takes place if chlorides, oxygen and moisture are present in sufficient quantities at the level of reinforcing steel. Glass Fibre Reinforced polymer sheets have been sheathed around beams to protect and strengthen them from the loss of shear strength and confinement due to the corrosion of stirrups. Glass FRP’s are unaffected by electrochemical and electromechanical degradation. GFRP’s have corrosive inertia for aggressive corrosive effects of acids, alkalis, salts and similar aggregates under a wide range of temperatures. GFRP’s can be applied on the surface of concrete with the little apprehension of environmental degradation. Moreover, the FRP wraps provide a protective layer that may resist further corrosion of steel.
A Study on TiO2-CeO2 nanocomposite coatings for corrosion protection of 304LN stainless steel
Authors: Kripa Suvarna M 
Published: May 2023

Abstract
Nano composite coatings are used to modify the substrate properties for a better life of the structures exposed to saline environments. Using a method known as spin coating, the authors of this study coated 304LN stainless steel with a mixture of TiO2 and CeO2 nano particles. The ratio of TiO2 to CeO2 in the coatings was 1:5:10:20 by weight percent. Stainless steel 304 was used as a substrate for the deposition of coatings since it is reasonably affordable. The effect that 3.5 weight percent NaCl solution had on the wett ability of the coating and its resistance to corrosion was investigated. The end effect is improved corrosion resistance in line with the rising coating weight percentage. After being exposed to the solution for 600 hours, the corrosion was significantly decreased. X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled to energy dispersive spectroscopy were used to investigate the deposits (EDS). The nano composites’ inherent physical features ensure their continued presence on the surface. The ratio of surface area to volume is satisfactory. According to the contact angle, the amount of water that is spreading out is extremely little. The photo produced cathodic protection feature of the TiO2-CeO2 coating is shown by the results of spin coating methods applied on 304LN stainless steel that was previously coated with TiO2-CeO2. After being subjected to the corrosion test, the coating made of 10% TiO2-CeO2 exhibited no signs of pitting or pinholes. The structural equation modeling (SEM) studies backed this conclusion. When it comes to the resistance to corrosion, the results produced by the contact angle are better. As a consequence of this finding, it was concluded that the coating could withstand the NaCl attack.
Development of high-performance concrete using ultrafine flyash
Authors: Jaiswal A K , Agrawal R , Trivedi M K 
Published: May 2023

Abstract
Increasing urbanization and industrialization demands advanced infrastructure over the existing structure, especially in a developing country (like India) where the population is very large and keeps on increasing. To deal with this complex situation there is an essential need for structures that have higher strength along with sustainability in design. The current project deals with the development of high performance concrete using ultrafine flyash. The project aims to develop high strength concrete of M-60 grade with binary blending of cement with ultrafine flyash and ternary blending of cement with ultrafine flyash and silica fume to produce precast concrete of M-50 grade. Further, the desirable percentage of ultrafine flyash in the development of high-strength concrete of M-60 grade and desirable percentages of both ultrafine flyash and silica fume in precast concrete of M-50 grade was found out to achieve the desired target strength according to the Indian standard criteria. Workability and compressive strength tests were performed on all the mixes. Results reveal that 5% replacement of cement by ultrafine flyash is the most desirable amount which can satisfy the criteria according to various Indian standard codes. Further, other strengths and durability tests were performed on desired concrete. The results show that desired concrete satisfies all the criteria and used in the development of the metro structure.
A comparison of the drilling material removal rate of plain GFRP and novel GFRP blended with banana fiber composite
Authors: Mohammed Adnan Shariff A , Anbuchezhiyan G 
Published: May 2023

Abstract
The current study aims to investigate the Material Removal Rate (MRR) of a glass fibre reinforced polymer composite with and without natural fillers (novel Grass powder, Banana fibre). The composites were made using the hand layup method. We employed three sets of nine specimens of the three different composites each to measure the MRR in CNC drilling process. Drill diameter, feed rate, and spindle speed were all controlled variables. Using the SPSS tool to analyse the results, a significant value of 0.025 (P0.05) was discovered. The material removal rates of samples with and without fillers were examined and contrasted based on the test results. Compared to regular GFRP, banana fibre has improved drilling properties. Blended banana fibre GFRP. Comparing banana fibre mixed GFRP to plain GFRP and new Grass powder blended GFRP, drilling properties of the former have been found to be greater.
An analysis on CNC machined surface roughness between AA7475 and AA7475/fly ash composite
Authors: Yahul Mohammed , Saravanan R 
Published: May 2023

AbstractThe present investigation is the influence of limited reinforcement of fly ash (5 wt%) effects on surface roughness. In this regard, the fly Ash reinforced aluminium alloy (AA7475) composite was prepared and machined and measured the surface roughness to compared to aluminium alloy (AA7475). The sample size is 32 (16 for each tool) with 95% CI pre-test power 80% was used. The surface grinding operation is used to remove surface abnormalities. These pieces are machined in specific contour milling and are performed with different tools. Machined specimens are tested using a profilometer for calculating surface roughness and it was performed according to ASTM D3039 standards. The findings suggested that the plain aluminium alloy (AA7475) had a surface roughness of 0.51 mm and the composite aluminium alloy (AA7475) reinforced with 5 wt% fly ash had a surface roughness of 0.38 mm. The statistical value analysis yielded a significance value of 0.034 (p>0.05), indicating that there was substantial variation across the groups. In this research investigation, it was found that the surface roughness of a composite made of a 5 wt% fly ash augmented aluminium alloy (AA7475) was 32.27% lower than that of a plain aluminium alloy.
DI-diesel engine fueled with orange peel calophylluminophyllum seed blended biodiesel
Authors: Balaji N , Shenbagaraman S , Ranjith S 
Published: May 2023

Abstract
Engines that run on diesel fuel are very important to the functioning of contemporary society. At the same time, they are a significant contributor to the pollution of the atmosphere. Because both the comfort of the atmosphere and the inter-related, we are unable to cut down on the usage of diesel at this time. This is a very precarious scenario. The number of vehicles that run on diesel continues to grow on a daily basis. We have no choice but to switch to alternate fuels such as biodiesel if we want to prevent this problem. In the current experiment, orange peel oil was combined with diesel in two distinct proportions: 20% orange oil and 80% diesel, and 40% orange oil and 60% diesel. The purpose of this was to compare the two different combinations. According to the findings, the mixture consisting of 40% orange oil and 60% diesel is the most effective one. Then, Calophyllum inophyllum oil was further added using a transesterification process mixed with potassium hydroxide, isopropyl alcohol, pH indicator, and methanol. Then, different cases were tested: (40% orange oil + 20% Calophyllum inophyllum + 60% diesel), (40% orange oil + 40% Calophyllum inophyllum + 20% diesel) and (100% diesel). The tests show that the break thermal efficiency of O40+C20+D40 and O40+C40+D20 is 4.36 % and 4.76 % which is almost similar. O40+C40+D20 increase the NOx emissions slightly, but it decreases the emissions of HC, CO, CO2, and smoke compared to O40+C20+D40. So, O40+C40+D20 is the best alternative fuel for diesel engines.
Experimental investigation of mini supersonic wind tunnel for flow visualization
Authors: Patwa Harsh , Gandhi Palakshi , Maharajan Srishti , Vishnu Kumar G C 
Published: May 2023

Abstract
The present study proposes to design, fabricate and investigate a miniature supersonic wind tunnel at an affordable cost, safe to operate, and reliable for education purposes. The configuration consists of a high pressure reservoir, and mini tunnel which will be used for providing the supersonic flow over aerodynamic models. To design the mini supersonic wind tunnel, the method of characteristics is used to ensure that any shocks that arise in contact with the surface do not impact the uniformity and velocity of the flow through the duct. To achieve the supersonic flow, the nozzle contour of the supersonic portion of the wind tunnel is built in such a way that the shocks nullify each other and have zero effect on the velocity of the flow. For compressible flow visualization, an affordable Schlieren setup consisting of a torch, mirrors, and a mobile camera is used for flow visualization. Finally, the visualization results of the present study is in good relation with the theoretical calculations. The present facility is also calibrated by measuring the oblique shock angle in the test section, in the range of Mach number 1.6 to 1.8.