bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of Printing Parameters for Printing of Ordinary Portland Cement using a Custom-made 3D Printer
Authors: Chaiyotha D , Pinitsoontorn S , Chindaprasirt P , Payakaniti P 
Published: February 2022

Abstract
3D printing techniques have recently received a lot of attention as a new technique for forming construction materials, due to benefits over the traditional cast. In this research, ordinary Portland cement (OPC) paste was formed using a 3D extruder. Optimized mixture and printing parameters were determined. Compressive strengths of the printed and the traditionally casted OPC paste were measured after the specimens were cured in saturated limewater for 7, 14 and 28 days, respectively. The result led to the conclusion that the most suitable mixture for printing was achieved at the water to cement ratio of 0.35 with water reducing and retarding admixture added. The optimum printing parameters were the printing speed of 60 mm/min and the feed rate of 120 ml/s. Compressive strength of the 5 x 5 x 5 cm3 hollowed and filled cubic printed specimens, were compared with casted cement paste. The strengths of both the printed and the casted specimens were higher with longer curing durations. The highest levels of strength were achieved at 12.36 MPa on the printed specimens and 80.88 MPa when testing the casted samples.
Effect of adding carboxymethyl cellulose, zeolite and microcrystalline cellulose on the optical and mechanical properties of latex composite films
Authors: Chindawong Chakkresit , Setthaya Naruemon , Mekrattanachai Pagasukon , Damrongwiriyanupap Nattapong , Pimraksa Kedsarin , Johannsmann Diethelm 
Published: February 2022

AbstractIn this research, four-types of latex composite films which are carboxymethyl cellulose latex composite film, zeolite latex composite film, microcrystalline cellulose latex composite film and microcrystalline cellulose sodium hydroxide latex composite film were prepared by casting method. Drying time of all films formation is 24 hr. The average thickness of the dry film is 0.10 mm. The transparency of films were measured by UV-Vis spectrophotometer. It was found that the carboxymethyl cellulose latex composite film have more transparency than zeolite latex composite film, microcrystalline cellulose latex composite film and microcrystalline cellulose sodium hydroxide latex composite film respectively. The analysis of functional group of films were measured by ATR-FTIR technique. It was found that all types of films consist of O-H stretching group and C=O group without ether group of cellulose and Si-O-Al group of zeolite. The mechanical property of films were measured by Universal Testing Machine. It was found that the Young’s modulus of microcrystalline cellulose sodium hydroxide latex composite film was higher than microcrystalline cellulose latex composite film, zeolite latex composite film and carboxymethyl cellulose latex composite film respectively. The characteristic of stress-strain curve of films showed that all films were hard and brittle except microcrystalline cellulose latex composite films were hard and tough.
Effect of essential oil on properties of PBAT/PBS for bio-packaging films
Authors: Threepopnatkul Poonsub , Charoendee Nattakit , Wiriyamontree Nattanan , Phodaeng Anuwat 
Published: February 2022

Abstract
This research aimed to study the effect of essential oil on the mechanical and barrier properties of bio-packaging films from a polymer blend between polybutylene adipate-co-terephthalate and polybutylene succinate (PBAT/PBS) using the β-cyclodextrin (βCD) as controlled release for sweet basil essential oil (ES). PBAT grafted with maleic anhydride (PBAT-g-MA) is used as compatibilizer between polymer matrix and β-cyclodextrin. The MA grating content is found to be 2.47% w/w. The preparation of PBAT/PBS blend films with two weight ratios includes 80/20 and 60/40 with varied βCD-ES contents of 0, 0.25, 0.50, 0.75 and 1.00 phr. Tensile strength and elongation at break were increased when β-cyclodextrin with essestial oil decreasing. Considering the ratio of PBAT/PBS, the mechanical properties i.e., tensile strength, Young’ s modulus and elongation at break of PBAT/PBS film at weight ratio of 80/20 incorporated with βCD-ES were higher than the ones at weight ratio of 60/40. For barrier properties, water vapor and oxygen permeability of PBAT/PBS films incorporated with lower essential oils content would be decreased. For antimicrobial test, PBAT/PBS with βCD-ES film packaging could effectively inhibit the mold growth on tomatoes after 40 days.
Cadmium(II) and copper(II) complexes containing benzoate derivatives and 2-aminopyrimidine ligands: Synthesis, crystal structures and antibacterial activity
Authors: Thummatudtho Sudarat , Phadungsak Natthakorn , Chainok Kittipong , Kandiah Mathi , Zheng Alvin Lim Teik , Andou Yoshito , Boonyuen Supakorn 
Published: February 2022

Abstract
The new Cd(II) and Cu(II) complexes namely [Cd2(2-OHbza)4(apm)4] (1), [Cu2(2-OHbza)4(apm)]n•2(2-OHbza) (2) and [Cu2(2-CH3bza)4(apm)]n (3) (2-OHbza = 2-hydroxybenzoate, 2-CH3bza = 2-methylbenzoate and apm = 2-aminopyrimidine) were successfully prepared by using direct one pot synthesis method. All complexes were characterized by using CHN elemental analysis, FT-IR spectroscopy, powder X-ray diffraction and single crystal X-ray diffraction techniques. Compound 1 crystallized in monoclinic space group P21/c, while compound 2 and 3 crystallized in triclinic space group P-1. The dinuclear compound 1 consists of two seven-coordinated Cd(II) centers which are doubly bridged by 2-OHbza bridging ligands, while the rest two 2-OHbza and two apm are terminal ligand. The crystal structure of compound 1 is stabilized by the intermolecular hydrogen bonding and C-H•••π interaction and π•••π interactions. Compounds 2 and 3 present zigzag one-dimensional chainlike-structure which dimer Cu(II) units are linked by apm ligand. The crystal structure of these compounds is stabilized by π•••π and C-H•••π interactions. The photoluminescence properties of compound 1 has been studied comparing to those of 2-OHbza and apm ligands. The solid state PL emission spectrum of compound 1 shows similar intensity of free apm ligand and shape to free 2-OHbza ligand which present a single broad band centered at λem 525 nm (λex = 325 nm), but blue-shift. For solution PL experiment of compound 1 in various solvents, the results showed that compound 1 is selective PL quenching acetone. Electronic spectra for solid state and solution in different solvents of compounds 2 and 3 present the d-d absorption bands centered in the range of 701 – 794 nm. The highest red shifts of λmax are found for compounds 2 and 3 in DMSO. In addition, the antibacterial activity of all compounds are investigated for S.aureus and E.coil by agar diffusion method. The results show that compound 1 exhibits the activity against S.aureus better than E.coil.
Biodiesel production from used palm oil using magnetic solid base catalyst
Authors: Singhanatkaisi Natthakit , Kandiah Mathi , Zheng Alvin Lim Teik , Ando Yoshito , Boonyuen Supakorn 
Published: February 2022

Abstract
In this research the biodiesel from palm oil were synthesized by using magnetic solid base catalyst. The magnetic solid base catalyst was prepared by using co-precipitation method and followed by modified Stober’s method and wet impregnation method. CaO-ferrite nanometre magnetic solid base catalysts (CaO@Fe3O4/SiO2) were synthesized by loading CaO on the surface of Fe3O4 core-shell using the polymeric binder, TEOS. Under the optimized condition reactions, the catalysts were synthesized by co-precipitation and incipient wetness impregnation followed by calcination at 700 °C for 5 h. The calcined catalyst was fully characterized. The basic strength of the catalysts (H_) was first assessed using Hammett indicators, which are in range 9.8–15.0. The calcined Ca/ferrite-TEOS showed homogenous spherical shape with an apparent thickness of 92 nm. The FT-IR of CaO observed at 520 cm-1 is attributed to the Ca-O vibrations. The EDX analysis confirmed the presence of Fe, Si and Ca on the catalyst. The optimization conditions for biodiesel production have been measured. The catalyst was used 5.0 % wt. The methanol to oil ratio is 5:1, reaction time is 180 minutes and reaction was produced at 80°C. The catalyst achieved a biodiesel conversion of used palm oil (acid value 1.2) above 92 %. The catalytic activity and recovery rate of CaO@Fe3O4/SiO2 are better as compared to CaO catalyst. The properties of synthesized biodiesel have been studied and meet standard the Department of Energy Business.
Estimation of ethylene/1-butene copolymerization conditions using the autoencoder model
Authors: Amnuaykijvanit O , Anantawaraskul S , Rakthanmanon T 
Published: February 2022

Abstract
Chain microstructures of ethylene/1-butene copolymers produced at specific polymerization conditions can be calculated using the copolymerization kinetic model. However, this kinetic model cannot be solved inversely to estimate polymerization conditions from desired microstructures. In this work, the autoencoder (AE) model, the machine learning techniques based on artificial neural network (ANN) concept, was developed to help estimate polymerization conditions to produce polymers with desired microstructures (e.g., molecular weight distribution (MWD), chemical composition distribution (CCD), and number and weight average molecular weight). Two models were developed in this work: one with only microstructural distributions (MWD and CCD) and the other with additional information on average microstructures and polymer yield. The results showed that the proposed AE models can adequately estimate polymerization conditions from desired microstructures with acceptable mean square error (MSE). More specific microstructures lead to better estimation of polymerization conditions with lower MSE.
Evaluation of alginate-cellulose used in controlled release fertilizer for slow nutrient release and water retention
Authors: Kamolsiriwat N. , Pianpanit T. , Pongkitiwanichakul P. , Boonchui S. 
Published: February 2022

Abstract
Alginate-cellulose is a green material with water retention properties. This research proposed the simulation model of controlled-release fertilizer by using the material with similar properties to Alginate-cellulose. We use the simulation model to investigate polymer-blended fertilizer performance compared to polymer-coated fertilizer and study the controlling factor of controlled releases, such as the shape of fertilizer and roughness of polymer coating. Our simulation result concludes that the fertilizer shape with a higher perimeter to the area for the unit area and roughness on imperfection coating causes the faster nutrient release. Moreover, we discover that polymer-blended fertilizer is acceptable for the alternative method of controlled-release fertilizer and can perform better with increased polymer proportion, especially when the polymer proportion is more than 30 %.
Influence of SFT Content on Physical, Mechanical and Dielectric Properties of BNKT-SFT Binary Ceramic System
Authors: Inthong S , Kruea-In C 
Published: February 2022

Abstract
In this research, the binary solid solution Bi0.5(Na0.84K0.16)0.5TiO3 and Sr(Fe0.5Ta0.5)O3 in the system of (1-x)BNKT-xSFT was synthesized by solid-state reaction technique. The mixed powder and ceramics of (1-x)BNKT-xSFT where x=0.00, 0.01, 0.02, 0.03 and 0.04 were calcined at 900 °C for 2 h and sintered at 1125 °C for 2 h. The sintered ceramic samples were investigated phase formation, densification, mechanical properties, and dielectric constant at room temperature. The XRD analysis of all condition samples shows a pure phase perovskite structure. The maximum of bulk density, HV, HK microhardness, the elastic modulus, fracture toughness, and dielectric constant were found at x= 0.04 condition which the value is 5.877 g/cm3, 6.21 GPa, 5.39 GPa, 181.12 GPa, 0.19 MPa·m1/2 and 1,404, respectively. A small among SFT content shows an improvement of densification, mechanical properties, and dielectric constant in (1-x)BNKT-xSFT ceramics. The relations of these results were discussed and compared to the previously reported.
Fabrication of Natural Rubber Latex Foam Composite Filled with Pineapple-leaf Cellulose Fibres
Authors: Pinrat S , Dittanet P , Seubsai A , Prapainainar P 
Published: February 2022

AbstractPineapple leaf (PL) is a renewable agriculture residue which are abundance in Thailand. In this paper, cellulose powder was extracted from PL. Celluloses are typically used as fillers for rubber reinforced composites due to their properties such as high mechanical properties, low cost, low density, and biodegradability. The aim of this study was to optimize the method to prepare natural rubber latex foam (NRLF) with different cellulose loadings from 0 to 7 phr by using Dunlop method. The different steps for adding celluloses in this study were adding in pre-vulcanization process and in foaming process were studied. The tensile properties, density, compression, and microstructural characterization were studied. Morphological and microstructural performed by using scanning electron microscopy (SEM). It was found that adding cellulose in pre-vulcanization step showed well distribution of cellulose while adding cellulose in foaming process showed the settle of cellulose at the bottom of the foam sample. The tensile strength and elongation at break decreased with increasing of cellulose content whereas modulus increased with increasing of cellulose content.
Preparation of cellulose nanofibers from cassava pulp residue by mechanical defibrillation
Authors: Suksri C , Aht-Ong D 
Published: February 2022

Abstract
Cassava pulp residue (CPR) is one of the most interesting renewable materials that is widely used as active precursors for many applications. Based on its characteristic, cellulose is a typical component locally found in CPR in which it plays an important role in various potential fileds such as reinforcing fillers, stabilizing agents, and dietary fibers. To prepare cellulose nanofibers (CNFs), mechanical defibrillation by microfluidizer is an effective method commonly employed to reduce the size of cellulose from micro-to nanoscale. In this work, CNFs were successfully prepared from CPR by alkaline treatment, hydrogen peroxide bleaching, and mechanical defibrillation at different times. Physical, thermal, and morphological properties of the resulting fibers were comparatively demonstrated. The results showed that most of the impurities in CPR including residual starch granules, lignin, and hemicellulose were removed significantly after chemical treatments. Additionally, thermal degradation temperatures of the obtained fibers were improved remarkably, while the degree of crystallinity with cellulose type I structure was also increased when comparing to CPR. As observed by FE-SEM analysis, the CNFs revealed a fibrous network structure having a mean diameter in the range of 10-30 nm. The produced CNFs could be utilized as reinforcing fillers, food packaging, and biomedical fields.
Quenches and confinement in a Heisenberg–Ising spin ladder
Authors: Lagnese Gianluca , Surace Federica Maria , Kormos Márton , Calabrese Pasquale 
Published: February 2022

Abstract
We consider the quantum quench dynamics of a Heisenberg–Ising spin ladder which is an archetypal model in which confinement of elementary excitations is triggered by internal interactions rather than an external field. We show that the confinement strongly affects the light cone structure of correlation functions providing signatures of the velocities of the mesons of the model. We also show that the meson masses can be measured from the real time analysis of the evolution of the order parameter.
Synchronization Model of Sea Transport Scheduling of Pioneer Ship and Sea Toll: Case Study at Maluku
Authors: Devintasari Dika Virginia , Yunianto Irwan Tri , Ardhi Eka Wahyu , Rahman Ilham Muliana 
Published: February 2022

Abstract
Sea transportation is the only vessels connected to islands in Indonesia, especially Pioneer Shipping that has an important role to connect the smaller and isolated islands to reduce price disparity. Pioneer shipping becomes a Feeder Vessel from Sea Toll and Pelni Passenger Ship that must be maintained reliability of scheduling accuracy in accordance with ministerial regulation number 37 of 2015. The aim of this research is to create a model of synchronization ship scheduling that considers to the arrival of the main ship (sea toll and pelni passenger ship) with feeder vessel (pioneer shipping) that can determine the impact financially for users (passengers and shipper) and ship operators. Agent-based simulation methods are used in this research to obtain scheduled arrivals and departures of ships using AnyLogic Software 8.7.4 (Personal Learning Edition). Therefore, schedule is considering the synchronization between the departure and arrival of the main ship (sea toll transportation and passenger transport) with the feeder (pioneering transport) ship.
Experimental Evaluation of Structural Hull Damping Coefficient of a Hydro-Elastic Segmented Submarine Model
Authors: Nugroho W H , Purnomo NJH , Priohutomo RK , Suwarni E 
Published: February 2022

Abstract
This paper presents an experimental study of determining structural damping ratio of the hydro-elastic submarine model. The model test of a hydro-elastic submarine model was conducted at the Towing Tank facility of the Indonesian Hydrodynamic Laboratory (BTH-BPPT). To investigate the effect of the wet and dry damping ratio the vibration tests were performed in both air and water. The experiments in wet and dry condition were undertaken to investigate the influences of the damping ratio at zero forward speed. Vibration tests were also conducted in the Towing Tank at speed in calm water to explore the effect of the forward speed on both fixed and free pitch conditions on the damping ratio. From these experiments it has been found the damping ratios of wet condition are greater than the dry one. The damping ratios increased also as the submarine model speeds forward, whereas both the fixed and free pitch showed an increase in the damping ratio with increase forward speed.
Analysis of Wrist Hand Motion for Monitoring of Basic Welder Training using Wearable Sensors
Authors: Pribadi T W , Shinoda T 
Published: February 2022

Abstract
During the training of a welder, either novice or professional, most activities are focused on the acquisition of wrist-hand motion skills. In the basic welding training, trainees initially required hand-on practices to acquire the skills of wrist hand motion to maintain the distance of electrode tip to a base metal such that the welding arc was continuously flaming. Secondly, trainees were practices of manipulating hand motion to follow seam tracking for joining two metals within defined speed & torch height. These practices were then continued for various types of weld joints. The result of acquiring this skill level was then assessed by inspecting the visual appearance of the weldment. In this study, an effort was undertaken to monitor and assess the progress of acquiring wrist-hand motion skills using wearable sensors: accelerometer, gyroscope, and magnetometer. Then, the record of those sensors was plotted as a time series signal compared with those performed by the training instructor. Their achievement of skills grade was analyzed using the Supervised Vector Machine (SVM) Learning Method. The result has indicated that this proposed method can assist in assessing welder trainees’ efforts to improve their skills.
Study of Offshore Patrol Vessel Models for Seakeeping and Maneuvering Improvement using Anti-Rolling Fins
Authors: Asmara I P S , Sumardiono  , Alfanda B D , Abdullah K , Rochmad A N 
Published: February 2022

Abstract
Offshore patrol vessel models using anti-rolling fins with variations of fin angle and shape are investigated in this study to improve the seakeeping and maneuvering performances, especially in the combat operation of the vessel. This study focused on the determination of the effect of adding fins to the seakeeping and maneuvering performances by optimizing fin angle and shape fitted on the ship hull. The 3D ship model with three variations of fin’s shape and four variations of the fin angle was analyzed using a numerical method of computational fluid dynamic (CFD) software. Result showed that fins type NAIAD 525, has the smallest average roll response occurs at 55 deg fin with motion amplitude 5.4E-05 deg. At the same fin angle, the average pitch amplitude reaches the smallest of 2.7E-03 deg. For PRAXIS type, the smallest average roll response occurs at 60 deg fin with motion amplitude 4.7E-05 deg. But for average pitch amplitude, the lowest value occurs at 45 deg of 2.7E-03 deg. And WESMAR type, the smallest average roll response occurs at 45 deg fin with motion amplitude 3.9E-05 deg. At the same fin angle, the average pitch amplitude reaches the smallest of 2.7E-03 deg. Turning maneuvers parameter of the vessel are comply with the IMO standard. The highest value of Tactical Diameter, which is 4.91 L, occurs in condition of no environmental disturbance, while the highest value of Advance occurs in wind disturbance condition with a value of 4.29 L.
Alternative Method for Stability Assessment of Indonesian Traditional Wooden Boats
Authors: Paroka D. , Azis M.A. , Muhammad A.H. , Rahman S. 
Published: February 2022

Abstract
Due to the small down-flooding angle, the available intact stability criteria were difficult to apply to an Indonesian traditional wooden. This paper discusses the application of the dead ship criteria of Second Generation Intact Stability Criteria as an alternative method to assess the stability of the Indonesian traditional wooden boats. The hydrodynamics factors correspond to the formula to calculate the heel angle due to wave were determined by model experiments. The calculations were conducted for four different down-flooding angles consisting of 20 degrees, 25 degrees, 30 degrees and 35 degrees with scattered wave data of Lombok Strait. The results showed that the critical metacentric height decreases if the down-flooding angle increases. The minimum area under the righting arm curve up to the down-flooding angle tends to be independent of the down-flooding angle. The capsizing index corresponds to the critical metacentric height decreased when the down-flooding angle increased. These results showed that the method to assess ship stability in the Second Generation Intact Stability Criteria could be used to evaluate the stability of the Indonesian traditional wooden boats.
Application of Navigation Light Monitoring and Control in Ship’s KRI Sampari 628 Based on Android
Authors: Pribadi Elwas Cahya Wahyu , Prananda Juniarko , Susanto Eko 
Published: February 2022

AbstractThe current BCC ( Bridge Control Console) system is still controlled manually mainly on the ship’s navigation lights, which requires the crew to come to the BCC room, so it will be difficult if the crew is far from the BCC room. From that problem the author wants to create a digital system, in this case an android-based control and monitoring system for navigation lights which is expected to be practical and efficient to operate both in the BCC room and outside the room. In facing the industrial revolution 4.0, the author uses the scientific field of Internet of Things (IoT) with the main electronic device, namely Arduino UNO with a MEGA 2560 microcontroller as the system control center, as well as the ESP8266 wifi module for controller communication. LDR is used to detect light, relay is used to switch lights, Interface is made based on applications installed on Android and the hardware is a series of systems and prototypes.