bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improving Quality of Microtremor Data with Application of Empirical Mode Decomposition Method, Case Study: East Tanjung Karang, Bandar Lampung
Authors: Ipmawan Vico Luthfi , Permanasari Ikah N. P. , Suhendi Cahli 
Published: October 2021

Abstract
Microtremor can be used for determining ground dynamical characteristic. We have measured microtremor data in East Tanjung Karang, Bandar Lampung. Collecting proper data in some urban areas like East Tanjung Karang is a difficult work because it produced data with a lot of transient signal caused by many human activities and industrial work. One of method to removed transient signal is Empirical Decomposite Method (EMD). EMD decompose an input signal (in time series) into several intrinsic mode functions (IMF) and a residual function. We made the first synthetic signal contained frequency with 1, 10, 20, and 30 Hz. EMD method was applied to the signal and obtained some Instrinsic Mode Function (IMF). IMF 1 has some frequency peaks that are 10, 20, and 30 Hz with power spectral density (PSD) amplitude 0.2, 0.9, and 1 W/Hz respectively. The second synthetic signal contained same frequency with the first one butbut the amplitude was 1, 1, 10, and 50 m. The results in IMF 1 from the second signal still have some peaks but spectral density in 10 Hz increases from 1 W/Hz (before applied EMD) to ±5 W/Hz (after applied EMD, in IMF 1). We applied EMD method also to Y1, Y2, and Y8 microtremor data. We remove IMF 1 or IMF 2 from the original data. The results are the removed IMF 1 data has less spike or transient signal in microtremor time series, but the removed IMF 2 data did not have significant change from the original microtremor. We sugested that higher IMF number, lower the dominant frequency. IMF cannot be related as a single oscillatory source because the result showed that IMF content more than one frequency peak. Removing IMF 1 produced by EMD method can improving quality of micrtremor data because it remove some transient data. This transient can be related to noise in higher frequency that originated locally. it can also decrease maximum standard deviation of HVSR curve. This study revealed revealed that removed IMF 1 data is has less change for both fundamental frequency and amplification factor than removed IMF 2 data in HVSR Curve.
Recent Sedimentary Deposit and Dynamics Sedimentation Analysis at Teluk Betung Using GPR Interpretation and Core Data
Authors: Febriansanu Dicko Rizky , Huseina Angga Ahya , Paembonan Andri Yadi 
Published: October 2021

Abstract
Lampung Bay is an area with a busy shipping traffic from port of Panjang and port of Teluk Betung. There are several river contain sediments and sedimented in Teluk Betung area. By conducting a research in this area, we can determine the sediment depositional system. The research method that will be used is the analysis of sediment deposition profiles from core data and interpretation from Ground Penetrating Radar (GPR). From sedimentary analysis, older sediments have a clay to coarse sand with relatively firm contact with coarsening upward patterns. In the top, they have a medium to clay with a fining upward pattern. The existence of a relatively thick clay layer indicates a relatively marginal depositional environment. These clay layers may form in the lower subtidal environment and gradually change to the upper intertidal environment until supratidal. This can be seen from the GPR result which show the sediment boundary. The GPR profiles confirm that the upper part mostly contains the sand or clay sand with sea water intrusion which has high conductivity and dielectric permittivity . The deeper zone could not well interpreted due to lack of the sediment information, but they show the contact of the sediment layers with different amplitude.
The Composition Of Coconut Fibers And Tofu Pulp As A Growing Media Of Oyster Mushrooms (Pleurotus ostreatus)
Authors: Taskirawati Ira , Sari Winda , Lebang Gracelia Katerien , Nurharis Muh , Abadi Eko Indriyanto , Baharuddin  
Published: October 2021

Abstract
Mushrooms are one type of Non-Timber Forest Product (NTFP) that can use as an alternative food. With the growing development of mushroom cultivation, especially oyster mushrooms, it is necessary to provide an alternative planting medium other than sawdust. Lignocellulose sources other than wood should try as an alternative to growing media, such as coconut fibers. Besides lignocellulose, fungal growth also requires a source of protein. This research offers another option as a source of nutrition, namely tofu pulp. This study aims to obtain the best composition of coconut fibers and tofu pulp as an oyster mushroom growth medium. The method used in this research is mixing the raw materials (cultivation media), raw material sterilization, inoculation, maintenance, and harvesting. There are six treatments in mixing raw materials, namely coconut fibers and rice bran (P1); coconut fibers and tofu pulp (P2); sawdust and bran (P3); sawdust and tofu pulp (P4); coconut fibers, sawdust and rice bran (P5); coconut fibers, sawdust, and tofu pulp (P6). This study provides the following results: for the observation of cultivation medium closure by mycelium, treatments P2 and P4 were not significantly different, but both have significantly different from other treatments. The same results also are shown in the observation of pinhead growth and harvesting of mushrooms. Meanwhile, the weight of fresh mushrooms harvested did not significantly affect all treatments. P6 is the best treatment composition to be used as a medium for growing oyster mushrooms.
Simulation of Microencapsulation Avocado Seeds Oil by Spray Drying
Authors: Salsabilah Naqiyyah , Karuniahaj Marwa Efira , Kautsar Duhaul Biqal , Suari Ni Made Intan Putri , Setyawan Heru , Nurtono Tantular , Widiyastuti  
Published: October 2021

Abstract
Drying air inlet temperature is one of the critical variables in the microencapsulation process by spray drying. However, when spray drying is carried out at inappropriate drying air inlet temperature, it can impact the particle produced. This study presents a simulation of spray drying from a mathematical model was developed to determine the effect of drying air inlet temperature on moisture content, particle diameter, particle density, and drying air outlet temperature in the microencapsulation process of avocado seeds oil as core materials and gum arabic as wall materials. For this aim, the mathematical model was developed then simulated using a matrix laboratory (Matlab) computer program with Euler numerical method for drying air inlet temperatures of 160, 180, and 200 °C. The selected model was validated with Cotabarren’s experimental results indicating the model was acceptable. The particles’ moisture contents predicted from simulation results are 1.170, 1.049, and 0.933 kg water/kg solid for 160, 180, and 200 °C, respectively. On the other hand, the predicted particle diameters are 29.73, 29.49, and 29.23 urn for 160, 180, and 200 °C, respectively. The predicted particle densities are 1215.72, 1225.21, and 1233.25 kg/m3 for 160, 180, and 200 °C, respectively. The prediction of drying air outlet temperatures was 39.76, 41.94, and 43.89 °C for inlet air temperatures of 160, 180, and 200 °C, respectively. The proposed models’ simulation results show that the higher temperatures caused lower particle moisture content, smaller particle diameter, and higher particle density. Also, the outlet drying air temperatures were always the same as the outlet particle temperatures.
Analysis of The Impact of Biochar Application on Soil Fertility and Productivity
Authors: Anika Nova , Marpaung David Septian Sumanto , Bindar Yazid 
Published: October 2021

Abstract
The increase agricultural production through intensification and extensification programs does not only provide solutions to food security, but it raises several challenges in sustainable production. In addition to increasing greenhouse emissions which have an impact on global warming, increased production also escalate the production of biomass waste. Although biomass waste is more environmentally friendly than oil-based waste, without proper treatment, this solid waste will have a negative impact on the environment and the sustainability of agricultural production. The conversion of biomass waste into new technology must be adapted to the characteristics of the biomass. Several studies have shown that biomass waste has the potential to be converted into products of higher value such as biochar. Biochar is a material converted from organic waste or agricultural / plantation waste that is rich in carbon, used to increase soil productivity . The long-term advantage of biochar application for the availability of plant nutrients is related to the high stability of organic carbon. The effectiveness of biochar application depends on the biochar production process, the amount of biochar that applied, the soil characteristic, the type of crop being cultivated.
Temperature and Heating Time of Forming Process of Nanofibrils of Whey Protein Isolate
Authors: Warji W , Purwanti N , Mardjan S S , Yuliani S 
Published: October 2021

Abstract
Nanofibrils are nano-sized fibers. One of the materials that can be used to make nanofibrils is whey protein isolate. Nanofibrils can be formed by heating whey protein isolate at a certain temperature and for a certain duration. This study examines the effect of heating temperature and heating time on the formation of nanofibrils. WPI was formed into nanofibrils by heating the WPI solutions at 70 °C, 80 °C and 90 °C for 0, 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 hours. WPI nanofibrils in the solutions is observed by placing the solutions in between a cross-polariser. Based on the results of the study, it shows that heating at 70 °C was observed for 2 to 20 hours and did not form nanofibrils whey protein isolate. The nanofibrils were formed for heating at 80 °C for 4 hours, but the population was still small; along with the length of heating the population of nanofibrils is increasing. Heating at 90 °C for 2 hours the nanofibrils began to form; the population is increasing along with the length of heating. Based on the image, the nanofibrils heating at 80 °C is similar to 90 °C heating. Heating 80 °C is sufficient for the process of forming whey protein nanofibrils.
Effects of Heat Treatment on The Wettability and Color Properties of Betung Bamboo (Dendrocalamus Asper) Strand
Authors: Sipahutar Wahyu Solafide , Maulana Sena , Augustina Sarah , Murda Rio Ardiansyah , Bindar Yazid 
Published: October 2021

AbstractBetung bamboo(Dendrocalamus Asper)has recently attracted interest as a sustainable reinforcement fiber in (polymer) composite materials. Utilization of bamboo has an advantages and disadvantages. It has a short growth cycle, lightweight, and good mechanical properties, but with poor wettability, dimensional instability, and low resistance againts biodeterioration agent. Some efforts have been devoted to alter and enhance its properties, especially wettability properties. Heat treatment under various temperature can enhance wettability properties due to chemical changes and migration of extractives, but also can induce color changes. Therefore, this study aims to investigate wettability properties and color changes of heat-treated Betung bamboo strand. The 1/3 middle of Betung bamboo was used as main material and converted into strand. Heat treatment temperatures applied were 140oC and 160oC for 3 hours. The wettability of Phenol Formaldehyde (PF) adhesive on heat treated Betung bamboo strand was measured using a sessile drop contact angle method. Constant contact angle and K-value were used as parameter of wettability. Color change of heat-treated Betung bamboo strand was measured by portable color difference meter model CDX 105 and characterized by CIE Lab. Results showed that the increasing temperature of heat treatment affected wettability and color properties. Contact angle tended to increase with an increase of temperature which is indicated an enhancement of wettability by making wood more hydrophobic. Increasing of temperature made Betung bamboo strand to be darker than that of control sample. Total color change (AE) values were 21.06 and 29.23 at 140 and 160 oC, respectively.
Study of mass transfer in liquid desiccant for dehumidifiers packed by using conventional wooden slats
Authors: Wisnu I , Idrus Alhamid M. , Nasruddin N , Lubis A , Septian K , Hafizh A 
Published: October 2021

Abstract
To reduce electricity consumption, heating ventilation from the airconditioning sector focuses on developing alternative solution electrically-driven vapour-compression system. The liquid desiccant air-conditioning system represents energy efficiency. It is more environmentally friendly as an alternative technology for the dehumidification process, especially in cases with high latent loads to maintain air quality under reduced conditions for comfortable. This technology is more efficient than the vapour compression system in hot and humid climates like Indonesia. This study carries out an experimental investigation to find out how much moisture removal with using a liquid desiccant to absorb humidity in the air and to know general types of correlations for heat and mass transfer in the contactor for the air solution. In this experiment, liquid desiccant will be passed through wooden slats to determine the physical and thermophysical properties of the air. The general equation will be verified by the experimental results using a curve that fits this expected. The result is a decrease in the humidity in the air. It is known from the amount of moisture absorbed by the drying liquid, and the highest is 336.49 g / s and the lowest is 19 g / s. So it can be concluded that the drying liquid that is exposed to air and passing through wooden slats effective removes moisture.
Effects of Bioadditives and Commercial Additive on the Performance and Exhaust Emissions of a Gasoline Engine
Authors: Prahmana Rico Aditia 
Published: October 2021

Abstract
One of our era’s greatest scourges is air pollution, on account not only of its impact on climate change but also its impact on public and individual health due to increasing morbidity and mortality. However, future climate change may exacerbate such human health impacts by increasing the frequency and duration of weather conditions that enhance the exposure to air pollution. Jakarta’s expanding fleet of motor vehicles is a key target of urgently needed actions to curb the hazardous air pollution in the city. This paper highlights the technologies and policies to reduce direct emissions from new and in-use cars, trucks, and buses in the city. Such policies, coupled with the promotion of mass transit, non-motorized transport, and other smart growth measures aimed at reducing transport demand, can significantly diminish the adverse effects of transportation on local air quality and public health in Jakarta, and spur similar actions across Indonesia. One of them is the addition of bioadditives (essential oils) and commercial additives that are widely sold in the market. In this study, the effects of essential oils (citronella oil and clove oil) as bioadditives and commercial additive on the performance and exhaust emissions of a single-cylinder, four-stroke gasoline engine was investigated, where both oils were blended with gasoline with a research octane number of 88. Based on the results, the maximum reduction in fuel consumption (33.33%) was obtained at an engine load of 43% when pure gasoline (G88) was blended with 0.1% of citronella oil and 0.1% of clove oil. This test fuel was labelled as BA2. The average reduction in fuel consumption was 18.54% for this test fuel. The thermal efficiency of the BA2 blend was higher even though it had the lowest volumetric efficiency compared with other blends. The unburned hydrocarbon (HC) and carbon monoxide emissions for the G88 fuel were 7 ppm and 0.202%, respectively, whereas the values were 20 ppm and 0.289%, respectively for the G88 fuel blended with Cleanoz commercial additive (CA1 blend). The HC and CO emissions were 11 ppm and 0.386%, respectively, for the G88 fuel blended with 0.1% of patchouli oil and 0.1% of clove oil (BA1 blend) whereas the values were 26 ppm and 0.631%, respectively, for the BA2 blend. Even though the BA2 blend had the highest HC and CO emissions, the values were still below the permissible limits for automotive vehicles in Indonesia.
Predicting Solar Irradiance Using Regression Model (Case Study: ITERA Solar Power Plant)
Authors: Asri Rishal , Friansa Koko , Siregar Sefrani 
Published: October 2021

Abstract
Simple regression model can be used to predict the solar irradiance which cover a certain area in certain interval of time. With combining some variables like relative humidity, temperature and wind speed, a model which describe local solar irradiance can be developed. This paper elaborates the details of recently developed simple regression model, built with python based open-source cloud computing platform. This model dedicated to predict solar irradiance in certain relatively small area. For current study, it was in ITERA Solar Power Plant, Southern Lampung, Indonesia. Generally, this model can be applied in any places with vary conditions as long as all the required parameters are met, even though can only predict the local solar irradiance in a relative small spot. According to the computational issue, a simple linear regression model can be used to estimate the solar radiation in Lampung Selatan, Indonesia. The correlation between solar radiation and the average air temperature can be approached linearly. The coefficient value may be vary, but our computational progress resulting at 0.72768 for without outliers.
The Potential for Green-Industrial Development (Case Study: Ujungjaya Industrial Estate, Sumedang)
Authors: Damayanti Verry , Maulana Riyad , Ekasari Astri Mutia , Pradifta Fachmy Sugih 
Published: October 2021

Abstract
Based on the Sumedang Regional Spatial Plan, the Ujungjaya Area is planned to become an Industrial estate. The planned types of industries are the manufacturing industry, textile industry, textile products and industrial engineering to support Kertajati Aerocity. Industrial development provides changes that have an impact on the socio-economy of the community, but on the other hand, it also brings changes that have negative impacts, including pollution to the environment around industrial estates. To prevent this, it is necessary to apply the green industrial concept, which in the production process prioritizes efficiency and effectiveness in the use of resources in a sustainable manner. Therefore it is necessary to study the potential for developing green industries in the Ujungjaya industrial estate. This research was conducted using a qualitative approach. The analysis method used is the quantitative SWOT analysis. The results showed that Ujungjaya Industrial estate is in a Turn Around Position in developing the green industrial estate. So the Ujungjaya Eco-industrial development strategy is related to how to overcome weaknesses to attain opportunities.
Analysis of Farmers’ Perception and Attitudes of Water Quality in Margodadi Embung, South Lampung
Authors: Nufutomo Tastaptyani Kurnia , Alam Firdha Cahya 
Published: October 2021

Abstract
Margodadi Embung (retention basin) is water pond that was designed for irrigation and conservation which is located in South Lampung, Indonesia. This Embung is surrounded through numerous farm fields, consisting of the cassava plant, corn plants, palm trees, and paddy fields. This research was aimed to know the farmers’ perception and attitudes of water quality in Margodadi Embung, South Lampung. Sampling was conducted using random sampling on farmers’ around the Embung, with the parameter of respondent profile, farming attitudes, knowledge about the Embung, and perception of the Embung water quality. The outcomes confirmed that the farmers had been using manure and chemical fertilizers for his or her fields, and also, they wiped clean their farm animals in Embung after plowing on the farm. Most of the farmers thought that the water quality is still good and fortunately, it was proved with the DO and BOD parameters that still be permitted according to Government Regulation no 82, 2001. However, it was indicated that the knowledge of the farmers of water quality will influence the perception and attitudes of the farmers towards the Margodadi Embung.
Dynamic Actor Network Analysis Approach In Management of Mass Public Transport Services
Authors: Ekasari A M , Pradifta F S , Rochman G P 
Published: October 2021

Abstract
Taking into account the progress of community mobility, increased motorization of private vehicles, congestion, and poor urban transportation services, the Bandung City Government seeks to provide mass public transport services Trans Metro Bandung (TMB). What policies should be established to achieve the successful implementation of the TMB program?. This study aims to provide recommendations to TMB management to achieve the success of services that prioritize reliability, comfort, and humanity. The analysis was carried out on stakeholder opinion using actor analysis method software, namely Dynamic Actor-Network Analysis (DANA). The involvement of all stakeholders is needed to get their views, perceptions, and opinions about the implementation of the TMB program. From the interview processing, the results obtained from the perception diagram and identified 19 different factors in one arena. The factors for reducing traffic congestion and improving services for mass public transport are defined as “goals”. The analysis of relevance and centrality identifies the limitations of infrastructure, facilities, and financing which are the main causes of the problem so that TMB services cannot be implemented optimally. In the strategy analysis, four actions were analyzed. The most ideal solution strategy that has the maximum utility value, the highest satisfaction, and lowest frustration score is the formation of a consortium and socialization.
Preliminary Technical Feasibility Analysis, Operational, Economic Of Radin Inten II International Airports Trains, South Lampung
Authors: Nurwanda Sari S.T M.T , Ananda Agneshia Putri S.T. 
Published: October 2021

Abstract
Lampung Province is the second largest province on the island of Sumatra. Given the function of Bandar Lampung as the capital city, its effect is very significant in increasing the need for comprehensive and optimal transportation. One of the problems with transportation in the city of Bandar Lampung is the effort to increase the mode of transportation, such as transportation to the International Raden Inten II International Airport. This research, conducted an analysis of the technical feasibility, operational feasibility, economic and financial feasibility of the Radin Inten II International Airport Train, South Lampung. This study uses 3 scenarios for the number of airport train fill in which the scenario is an optimistic scenario, a moderate scenario and a pessimistic scenario. Technical feasibility can be said to be feasible to operate if several indicators are met. Based on the results of the analysis, the airport train is not feasible to operate if it uses the existing line. A project is declared economically and financially feasible by comparing the feasibility parameters such as NPV, BCR, IRR, and Payback Period. Meanwhile, based on the results obtained, the feasibility parameters used indicate the economic feasibility analysis of the highest NPV value: Rp. 32,490,236,361,014> 0, BCR: 0,269, <0, and IRR: 21.04%. While the financial feasibility analysis of the highest value is obtained in the optimistic scenario where the NPV value: Rp. 467,181,556,733> 0, payback period of 20 years, and IRR: 6.36%. It can be concluded that only the optimistic scenario shows that all investment parameters are feasible to use. The results of the sensitivity analysis show that the project is more sensitive to the age of the concession