bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal vacuum evaporation peculiarities of perovskite-type barium-strontium hafnate
Authors: Taran A , Kyslytsyn O , Podshyvalova O , Taran S , Okhrimovskyy A 
Published: November 2023

Abstract
Experimental results are presented on the thermal vacuum evaporation of barium hafnate BaHfO3 and double barium-strontium hafnate Ba0.5Sr0.5HfO3, which are included together with finely dispersed tungsten as components in sintered composites. It is found that at T = 1900 K only barium and barium oxide are the products of BaHfO3 evaporation, i.e., congruent evaporation of BaHfO3 does not occur. Investigations of Ba0.5Sr0.5HfO3 evaporation at T = 1600 K showed that it also does not evaporate congruently. At the same time, the nucleation of a new phase of BaO·SrO in the form of structures with D6 symmetry was detected. Using a high-current vacuum arc discharge, congruent evaporation of Ba0.5Sr0.5HfO3 takes place, forming various crystalline formations of double barium-strontium hafnate on the substrate.
The nature of kaolinitic clays and their impact on the performance of SCM
Authors: Vejmelková E , Pommer V , Šádková K , Koňáková D 
Published: November 2023

Abstract
Nowadays, metakaolin is currently widely used as a supplementary cementitious material in the concrete industry. However, there are significant differences between kaolinitic clays, which can be used for the production of metakaolin. They can vary in the granulometry as well in the mineralogical composition (more precisely the content of varying impurities can differ widely). The main aim of this article is to assess the impact of mentioned variation on the thermal activation of such kaolinitic clays. For this purpose, four clays from the Czech Republic were chosen and examined. Primarily, their characterization composed of XRD, DSC, granulometry, and specific surface area was studied. Then these clays were thermally activated at temperatures from 500°C to 650°C. Afterwards, the changes in determined properties were investigated. Then the samples of blended cement pastes with a replacement level of 15% were produced, and basic physical and mechanical properties were determined. It was proved that for particular clays, different temperature treatments were optimal, which further lead to varying results of the mechanical performance of blended cement-based pastes. Such variation can be linked to the phase composition of studied clays.
Application of numerical modelling to evaluate the influence of smoke extraction flaps on fire safety of the buildings
Authors: Wlazlo M , Paśnikowska-Łukaszuk M , Szulżyk-Cieplak J , Zaburko J , Suchorab Z , Guz Ł 
Published: November 2023

Abstract
The aim this paper is to present the simulation of the building in the computer program PyroSim by Thunderhead Engineering based on the FDS calculation engine. The article presents simulations of the use of smoke vents and their impact on fire safety in a public building based on the Fire Dynamics Simulator (FDS) calculation engine. Two scenarios were analysed in the simulation. The first simulation shows 180 seconds of fire without the smoke vent, while the second simulation shows 150 seconds of fire with the smoke vent open. A fire power density of 500 kW/m2 was adopted and is used in each case as well as the fire development coefficient, which was calculated on the basis of literature data. On their basis, simulations were carried out, the results of which were used to draw conclusions.
Thermal diffusivity and thermal expansion investigations of WLV steel
Authors: Zieliňski M , Koniorczyk P 
Published: November 2023

Abstract
WLV steel (32CrMoV12-28) with a density 7.80 g/cm3 at room temperature (RT) was used to study the temperature characteristics of thermal diffusivity and thermal expansion in the temperature range from RT to 1100°C Two types of NETZSCH flash devices were used, i.e. low-temperature LFA 467 and high-temperature LFA 427. A sample of NETZSCH Inconel 600 with a density of 8.35 g/cm3 at room temperature in the temperature range from RT to 480°C was used as the reference material. The reference material was used to determine the thermal conductivity and specific heat by the comparative method. The results of thermal diffusivity tests of WLV steel made with the LFA 467 and LFA 427 apparatus turned out to be consistent with each other. Measurements of thermal expansion of WLV steel were carried out using a NETZSCH DIL 402 C dilatometer. The results of thermal expansion studies indicated a ferrite-austenite phase transition at 835°C, which causes shrinkage of the material. WLV steel has been tested for military use as barrel steel. The paper presents the thermophysical properties of this steel in a wide range of temperatures so that they can be used as input data for numerical simulations of heat transfer in cannon barrels.
Fisheries characteristics and biology of Indo-Pacific King Mackerel in Tarakan Waters, North Kalimantan
Authors: Yusuf Helman Nur , Baihaqi  , Hufiadi  , Chodrijah Umi , Pane Andina Ramadhani Putri , Noegroho Tegoeh , Mahiswara  
Published: November 2023

Abstract
The Indo-Pacific king mackerel (Scomberomorus gutatus) is one of the catches of drift gill nets in the waters of Tarakan, north Kalimantan, and makes an important contribution to fisheries production in the region. In order for its use to be sustainable, it is necessary to make efforts to manage fish resources based on studies of fisheries and their biology. Monthly data for the period January to November 2021 were obtained from tangkahan based on tarakan with the aim of obtaining information and analyzing the dimensions of fishing gear, fishing grounds, catch composition, frequency of fish size, and fishing effort (cpue). Furthermore, fish biology data were analyzed by the analytical method. the results showed that there was a change in the dimensions of the longer fishing gear; the abundance of fish caught by drift gill nets was dominated by indo-pacific king mackerel (Scomberomorus gutatus) (49.3%), dorab wolf-herring (Chirocentrus dorab) (12.8%), fourfinger threadfin (Eleutheronema tetradactylum) (8.5%), silver grunt (Pomadasys argenteus) (4.7%), narrowbar spanish mackerel (Scomberomorus commerson) (4.3%), barramundi (Lates calcarifer) (2.3%), goldstripe sardinella (Sardinella gibbosa) (2.2%), common pike conger (Muraenesox bagio) (2.2%), daggertooth pike conger (Muraenesox cinereus) (1.9%), needleskin queenfish (Scomberoides tol) 1.7%, great barracuda (Sphyraena barracuda) 1.3%, and other fish (11.1%). The distribution of fishing grounds is dominated by grid 6005 by 46.5%, grid 6004 by 7.08%, and grid 5760 by 6.7%. The length at first capture (lc) of mackerel was 38.06 cmfl. The yield per unit effort (cpue) of drift gill nets in Tarakan is an average of 44.3 kg/day.
Wave Reflection of Concrete Armour Unit: A 2D Physical Model Study
Authors: Armono H D , Irawan C , Utami W , Sahid A I , Maula A I , Hafiz M B D G , Arifin M F , Luthfi A Q 
Published: November 2023

Abstract
A breakwater is a coastal structure that breaks the wave energy coming towards the beach. When a wave hits an object, it will be reflected entirely or partially. Initially, the primary layer units on the coastal protection structure were only composed of large piles of natural stone. It is becoming increasingly difficult to find a natural stone of the right size, and to prevent its scarcity; natural stones are commonly replaced with concrete blocks. This study conducted the reflection coefficient analysis on the BPPT Lock concrete armor unit. Physical model testing was carried out on the wave channel of the Coastal and Port Infrastructure Laboratory, Department of Ocean Engineering ITS. From this study, it was found that the reflection coefficient on BPPT Lock ranges from 0.512 to 0.828 at a wave steepness of 0.002088 to 0.0117 with a structural slope angle of 1: 2. The reflection coefficient value is influenced by wave height, wave period, and the slope angle of the structure.
Evaporation Rate Analysis Of Raw Water In Salt Production Using a Prototype At Salt House
Authors: Nuzula Nike Ika , Masruroh Ika , Kartika Ary Giri Dwi , Efendy Makhfud , Setiyawan Fany 
Published: November 2023

Abstract
In Indonesia, the famous method of the salt production process is evaporation using solar energy. The important aspect of this method is the evaporation rate. The evaporation rate is nearly related to the physical conditions of the surrounding environment. The aim of this study is to determine the evaporation rate of raw water in the production process using a prototype and determine the effect of physical parameters on the rate of evaporation of raw water in the production process in the salt house. The causal method with a quantity approach was used in this research. The results obtained are the total evaporation rate on the prototype at the Salt House is 1.68 litters/day and the results of Spearman rank correlation show that luminous intensity, air temperature, and wind speed have a significant impact on the evaporation rate because the significant value is <0.005 while the humidity level is not s significant effect.
Numerical Study of the of Proposed Hexaloc Concrete Armor Units under Static Loading
Authors: Irawan C , Armono H D 
Published: November 2023

Abstract
Concrete armor units are commonly used to protect shorelines and rubble mound coastal structures. This paper presents the numerical modeling test results for the proposed Hexaloc armor unit under static load. The model shows some value of tensile stress exceeds the critical stress. It was found that the cracking occurred at the top surface of the leg. In the design, the moment due to hydrodynamic and impact loads is not permitted to exceed the cracking moment.
Exploitable biomass and acceptable biological catch (ABC) for spiny lobster Panulirus polyphagus from the coast of North Kalimantan, Indonesia using data-limited fisheries
Authors: Tirtadanu  , Chodrijah Umi , Amri Khairul 
Published: November 2023

Abstract
The acceptable biological catch (ABC) can be applied as a management tool to maintain the lobster stock sustainability in North Kalimantan waters where the overfishing condition of lobsters has been detected. Using data-limited fisheries, this study determines the exploitable biomass and ABC of mud spiny lobster (Panulirus polyphagus). The biomass was estimated based on biomass-based length cohort analysis. The exploitable biomass is considered from the biomass at a size larger than the minimum landing size (≥80 mm). The results showed that the total exploitable biomass was estimated as 51,062 kg, and the ABC can be considered as 14,306 kg. The reduction of yields is needed as 26% from the current annual yield to reach the ABC. The catch quota can be given to each fisherman to manage their fishing effort to fill the allowable catch quota. The cooperation between the government, fisherman and market agents is critical to support the implementation of the catch quota system.
Phytotoxicity test of cadmium and lead on Sunflower (Helianthus annuus L.) as first step in phytoremediation
Authors: Nirwisaya Pertiwi Margarana , Titah Harmin Sulistiyaning 
Published: November 2023

Abstract
Phytoremediation is a remediation process by using a plant to eliminate, accumulate, or absorb contaminated material by utilizing hyperaccumulator plants, such as sunflower (Helianthus annuus L.). This method was chosen because it is eco-friendly, effective, low cost, and easy to be implemented. The aim of this study is to determine maximum concentration which Helianthus annuus L. can survive. This research was carried out for five weeks starting in August – September 2022 which began with preparation by seeding of sunflower seeds on garden soil, then continued with range finding test using variations of sunflowers and media composition. The contaminated soil was obtained from Tamangapa Landfill Makassar. The pH, temperature, and moisture of each variation media composition were also monitored. Based on the results, all variations of Helianthus annuus L. can survive without any apparent negative side effects in 100% contaminated soil media with cadmium and lead concentration at 2.233 mg/kg and 166 mg/kg, respectively.
Neural Network Modelling for Prediction of Coagulant Dosage
Authors: Salsabila Berliana Khansa , Nurhayati Ervin , Raditya Murry , Shiddiqi Ary Mazharuddin 
Published: November 2023

Abstract
Water treatment plants (WTP) in Indonesia commonly applied conventional treatment that, among others, relies on the coagulation process to treat turbid surface water to produce clean and safe water for daily purposes. Meanwhile, standard Jar-Test methods for coagulant dosage determination are inefficient, inaccurate, and possibly will not function well for water with high variability of quality. This study aims to improve and optimize the coagulant dosing process by considering the main parameter that greatly affects the coagulation process, i.e., turbidity. For this purpose, a multilayer artificial neural network model (ANN) with an adaptive backpropagation algorithm was developed using MATLAB software. A network architecture with 1 input, 5 hidden and 1 output was implemented. For the input, 4465 turbidity data of the raw water taken from Surabaya Municipal Water Enterprise (PDAM) were used, while the output is the optimal dose obtained from the results of the Jar-test. This study resulted in an empirical model of the optimum dosage of coagulants as a function of the turbidity of the raw water. Training and testing on the given ANN resulted in R2 (determination coefficient) of 0.99444 from regression analysis with the following equation: output = 0.99 x target + 0.66. This study showed that the ANN model provides a very high success rate for coagulant dose prediction.
Removal of Remazol Black B dye using recirculation batch electrocoagulation
Authors: Hanako A , Bagastyo A Y 
Published: November 2023

Abstract
Textile industry wastewater mainly contains high concentration of organic matter including the active dye of Remazol Black B. This wastewater effluent needs to be properly treated before discharge into water bodies. Electrocoagulation is one of physico-chemical methods that can be used as an alternative of wastewater treatment in the textile industries because it has a good efficiency in removing colour. A wide range of pH measured in the textile industry wastewater (i.e., 3.9-14) may affect the effectiveness of electrocoagulation process. Other factors that affect electrocoagulation process were current intensity and wastewater flow. This study aims to determine the optimum of electrocoagulation process in the recirculation batch method using recirculation batch reactor. The applied current tested were 10 A, 15 A and 20 A, with flow rate of 2 L/min, 3 L/min, and 4 L/min. A synthetic textile wastewater was prepared with a Remazol Black B dye colour concentration of 10 ppm, 3 g/L of NaCl, and pH of 11. The parameters tested periodically in this study were pH, TDS and removal of colour and COD. Result of this study showed that by increasing the electric current strength and decreasing the flowrate, efficiency of pollutants removal was increased. Highest removal percentage of COD and colour were 100% and 88,78%% with current strength of 20 A, and flow rate of 2 L/min, the final pH was 11,4, whereas total dissolved solid fluctuated (i.e., 1785 mg/L– 1902 mg/L).
Coral recruits on concrete hemispherical artificial reef (HSAR) with different composition in Pasir Putih, Situbondo, Indonesia
Authors: Muzaki F K , Saptarini D , Armono R H D , Sari I K , Afifah A N 
Published: November 2023

Abstract
Artificial reefs (AR) are artificial habitats laid in seabed by mimicking some of the characteristics of natural reefs, hence can be used as natural substrates for recruitment process for coral larvae. One of well-developed AR is concrete hemispherical artificial reef (HSAR) which serve as a solid platform for settlement and recruitment processes of coral larvae. In this study, we constructed HSAR made of concrete with crushed shell waste (CSW) and fly ash-bottom ash (FABA) as substitutes for coarse and/or fine aggregates. The purpose of the research is to compare the diversity, density and level of coral recruitment on HSAR with different composition; namely C1), conventional concrete composed by a mixture of Portland cement, sand and gravel (1:3:2); C2), concrete with CSW as substitutes for gravel or coarse aggregates (1:3:2); and C3) concrete composed by Portland cement, FABA, sand and CSW (1:2:2:1). Observation of coral recruits conducted in-situ in Pasir Putih beach, Situbondo, East Java, Indonesia. All observed ambient environmental parameters (temperature, salinity, lucidity, level of dissolved oxygen and sedimentation level) are in range for tolerance level of coral growth and development as well as to support larval settlement and recruitment. Results of one-way Anova and LSD test (p = 0.05) showed that there was no difference in term of density of recruits in C1 (9.5±2.07 colonies/m2) and C2 (8.7±2.5 colonies/m2), yet significantly differed with C3 (6.5±1.43 colonies/m2). We identified at least 12 genera of coral recruits grown on the surface of HSAR, dominated by Acropora (60.08%), Porites (26.98%) and Seriatopora (17.06%), respectively; with relatively similar genera composition on each AR. These results suggest that addition of CSW to concrete AR may not have significant positive effect on the coral larval settlement. Furthermore, concrete AR contain FABA was presumably less suitable for coral recruitment process.
An Environmental Impact Framework for the Construction Stage of Municipal Solid Waste Landfill Mining: A Study on Piyungan Landfill in Indonesia
Authors: Kasam  , Iresha Fajri Mulya , Putra Hijrah Purnama 
Published: November 2023

Abstract
At present, the predominant method of urban waste management in Yogyakarta is centered around landfill disposal, resulting in a swift depletion of available capacity, notably at the Piyungan landfill site. Consequently, the exploration of landfill mining, a process that entails the retrieval of fully decomposed waste, is being contemplated as a potential alternative. Nevertheless, the execution of this initiative may give rise to environmental consequences. The objective of this study is to establish a comprehensive framework for assessing the ecological consequences of landfill mining operations in the initial stage of construction. The methodology encompasses a preliminary stage known as scoping, wherein potential impacts are identified and significant hypothetical impacts are assessed. Subsequently, a thorough assessment is conducted to examine the potential significant effects of the hypothetical scenario. This evaluation involves a detailed analysis of the various environmental elements and parameters associated with each activity that may serve as a potential source of impact. The present analysis employs a straightforward matrix and a flow chart. The assessment indicates that the implementation stage of landfill mining has the potential to generate substantial hypothetical effects on multiple facets of the environment, encompassing physical, chemical, biological, socio-economic, and cultural dimensions. The potential impacts encompass various factors such as air pollution, gas explosions, reduced surface air quality, odor problems, and unfavorable public attitudes and perceptions. These impacts collectively contribute to the overall consequences of the situation.
Recycling Waste Lubricants with Different Types of Base Oil into Low Sulfur Fuel with Two Stage Distillation Pyrolysis Process
Authors: Lestari S RR , Lestari P , Damanhuri E , Sukandar  
Published: November 2023

Abstract
The intent and purpose of the research is to improve fuel performance by recycling waste lubricants into low sulfur fuel, using waste lubricants made of various types, namely mineral, semi-synthetic, full synthetic, and mixtures from different sampling sites, with the scope of lubricant waste coming from motorcycles. Recycling waste lubricants is chosen in 2 stages, to get purer fuel and better fuel performance, it is called a distillation pyrolysis process. The advantage of using this distillation pyrolysis process is that it does not use high temperatures, and is cheap and fast. Waste lubricant recycling using a two-stage distillation pyrolysis process produces a fuel with a sulfur content that decreases by 61.98 %wt -68.61%wt in stage I and 66.32 %wt - 70.66 %wt in stage II for waste lubricants with four different base oil. Thus, proving that the two-stage distillation pyrolysis process can reduce sulfur content and can also improve fuel performance at the characteristic values of several other chemical properties.
Macroorganism-Assisted Bioconversion of Organic Waste by Mealworm (Tenebrio molitor): An Investigation of Process Efficiency and Sustainability
Authors: Iresha Fajri Mulya , Lathifah Annisa Nur , Maharani Salsabila Dyah , Rahmat Ali 
Published: November 2023

Abstract
Organic waste management is still a big challenge that still requires a solution. Currently composting is a method that is commonly used, but ordinary composting takes a long time to reduce the mass of organic waste. Utilization of bioconversion agents is one strategy that can be used in processing organic waste. Mealworm (Tenebrio molitor) is an insect that can be used as bioconversion. This study aims to determine the feed consumption rate, mealworm growth, and the physical and chemical of the compost. The results showed that feed consumption increased during the incubation period with the highest level in reactor 1 with fermented vegetables using EM4 + wheat bran as feed. While the highest weight of mealworm larvae was found in reactor 3 with a weight of 196 g. The values for water content, temperature, colour are in accordance with the Indonesian Compost Standard (SNI: Indonesian National Standard). The pH decreased with the incubation period. The pH of the compost from Reactor 1 and Reactor 2 complies with SNI. Compost content of P and C/N ratio are not in accordance with quality standards, while for K the results obtained are in accordance with SNI. Where the P value obtained ranges from 0.0007 - 0.0032%, K values range from 26 - 45% and C/N ratio values range from 0.55 to 1.99.