bluuebunny/crossref_metadata_2025_split huggingface dataset:
Classification of Rastrelliger kanagurta and Rastrelliger brachysoma using Convulational Neural Network (CNN)
Authors: Kurniawan K , Sedayu B B , Hakim A R , Erawan I M S 
Published: February 2022

Abstract
Mackerel is an important commercial caught fish for local fishermen, including Rastrelliger kanagurta and Rastrelliger brachysoma. However, to distinguish these two species is rather difficult because of their similar appearance. Convolutional Neural Network (CNN) is a deep learning method that can be used to classify images. One of parameters contributing to the level of accuracy is the layers number applied in CNN architecture. This study aims to classify those two species using CNN with a range of two to five convolutional layers architectures i.e CNN1, CNN2, CNN3 and CNN4, respectively. In this study, 434 images were used as a training group with 217 images for each class. The validation group consisted of 21 images for each class and the test group consisted of 19 images. The results showed that the CNN3 provided the best training and validation accuracy of respectively 100% and 92.6%. The lowest value of training loss and validation loss of 0.000057 and 0.49. The accuracy values of the CNN models using different testing images reached 94.7%.
The effect of the performance of using a boost converter on the voltage of the solar panel
Authors: Supraptono E , Abiyasa B P , Putri R D M , Andrasto T 
Published: February 2022

Abstract
In designing a grid-connected photovoltaic generator system, a DC-DC converter is needed to increase the photovoltaic output voltage. In designing this converter, a converter with high static gain is usually used in order to increase the photovoltaic output voltage and obtain high conversion efficiency. However, conventional converter has static gain with low output voltage. Conventional converter can only increase the output voltage from the input voltage when the Duty Cycle is 0.75. To meet the high standard of static gain, an output voltage of 2.93 – 3.59 times the input voltage is required. To overcome that problem, the authors propose the use of DC-DC converter topology. Modification on the conventional converter is carried out by adding capacitors and diodes. With the application of this converter, it can be concluded that the output voltage of the converter can be increased for photovoltaic application.
Technical study of 1.2 KWP solar plant on Tanbihul Ghofilin Islamic Boarding School Banjarnegara
Authors: Windarta J , Denis  , Firmansyah A , Avinda A I , Kusuma I A 
Published: February 2022

Abstract
The depletion of fossil energy, especially oil and gas, and international commitments in reducing emissions haves prompted the government to make renewable energy a top priority to maintain energy security and independence. One of the renewable energies that has great potential in Indonesia is solar energy. Indonesia’s solar energy potential reaches 207.8 GWp. However, Indonesia’s current installed capacity is only 0.085 GWp or 0.04% of the total solar energy potential in Indonesia. The purpose of this study was to design and analyze the technical potential of on-grid solar plant installation at the Tanbihul Ghofilin Islamic Boarding School with a capacity of 1.2 kWp using PVsyst 7.2 software. This Solar Plant is estimated to produce 1.7 MWh of energy in one year with a Performance Ratio of 84%.
Nutritional content and preference analysis of red dragon fruit spaghetti
Authors: Saptariana  , Budiono R 
Published: February 2022

Abstract
Culinology was a mixture between the disciplines of food science and the culinary arts. The development of knowledge, then the culinary field developed by utilizing science that used physics and chemistry. Molecular gastronomy was a field of study that studies chemical and physical reactions as well as the transformations that occur from food during the cooking process and sensory phenomena consumed. One of the applications of molecular gastronomic techniques was the manufacture of fruit spaghetti. Spaghetti is a food that looks like noodles, the ingredients that make spaghetti are wheat flour and eggs. Fruit spaghetti was the spaghetti of fruits, in this case it used red dragon fruit. The purpose of the study to find out: 1) The public interest in dragon fruit spaghetti fruit 2) The content of vitamin C and fiber fruit spaghetti. This type of research is an experiment. The data was analyzed used descriptive of percentages. The results showed: Fondness for fruit spaghetti in aspects of colour, taste, texture and aroma the highest percentage was on the criteria of very like and like in all four sample groups. The more dragon fruit used, the higher the vitamin C and coarse fiber.
Weeds as an environmentally friendly alternative dyes
Authors: Atika  , Kamis A , Syamwil R , Widowati  , Fadia I S , Milannis A S 
Published: February 2022

AbstractSynthetic dye liquid waste is a problem in the batik industry. The data showed that there are 5 rivers in Pekalongan which are dark coloured and stinks due to the batik industry’s liquid waste. The test result showed that the waste in upstream contains Chemical Oxygen Demand (COD) 230 mg/L and 157 mg/L in downstream, while the maximum COD treshold should only be 50 mg/L. Environmentally friendly colouring technology is currently needed in the business. Natural dyes can be an alternative to produce batik. Weeds or parasites are considered an alternative to natural dyes. Weeds are plants which the existence is not wanted by humans. This research was conducted by experimenting the application of extraction of weeds or parasites on batik fabric. The objectives of this study were, the direction of colour produced by weeds or parasites through the extraction process, and analysis of the colour lasting test.
The influence of Arenga pinnata fibres – reinforced orientation on tensile and fextural strength of epoxy matrix based composite
Authors: Widodo R D , Darsono F B , Rusiyanto  , Mukmin K , Masturi  
Published: February 2022

Abstract
The purpose of this study is to determine the tensile and flexural strength of Arenga pinnata fibres-epoxy as composite material. The Arenga pinnata fibres were soaked in 5 % NaOH solution for 2 hours. The specimens of the composite were prepared with different orientations Arenga pinnata fibres (i.e. 0° + 0°, 0° + 45°, 0° + 90°, and 45° + 90°). The Arenga pinnata fibres were mixed with epoxy and hardener also at the fibres volume percentage of 40%. The hand lay-up (HLU) process in this experiment was to produce a specimen test. The dimension of the specimen test for the tensile and flexural test was adapted from the ASTM D-3039 and ASTM D-7090 03 respectively. Results from the tensile test and flexural test of Arenga pinnata fibres reinforced epoxy composite, show the orientation 0° + 0° has the maximum of tensile and flexural strength, which are the value of tensile and flexural strength are 77.385 MPa and 76.38 MPa respectively. The tensile test shows that the fibres orientation parallel to the tensile force will give a maximum strengthening effect. The bending test shows that the orientation of the fibres across the compression force will produce maximum flexural strength.
Preparation and characterization of activated carbon derived from the bovine bone doped urea as an electrode material
Authors: Khoirina N , Nugraheni A F , Alfian A A , Rengga W D P 
Published: February 2022

AbstractActivated carbon was prepared as an electrode by utilizing available bovine bone waste. This material is an alternative to graphene, which still has a high price value. The aims of this study were to characterize and analyze the effect of urea on the manufacture of activated carbon as an electrode, and to analyze the performance of ultracapacitors from modified electrodes combined with several electrolytes. Urea is formulated because it has a nitrogen group in the activated carbon synthesis process. Treatment of bovine bone carbon started from size reduction and carbonization, activation with KOH. While the carbon modification process added urea (1:1, 1:2, 1:3) and continued with washing and neutralization. Activated carbon powder has hydroxyapatite, CaO, and CaOH, which maintains its macroscopic structure during combustion. On the carbon surface there are active groups such as hydroxyl, amine derivatives, phosphates. Carbon with a large surface area has nanometer-sized porosity and pore volume so that it can be used to provide space for energy storage. The results showed that the carbon added with urea (1:2) had the best characterization. The performance of the ultracapacitor was measured by its capacitance of 292 F/g and 0.1 A/g in the organic electrolyte liquid TEABF4.
The effect of hydroxyapatite concentration on the mechanical properties and degradation rate of biocomposite for biomedical applications
Authors: Fitriyana D F , Nugraha F W , Laroybafih M B , Ismail R , Bayuseno A P , Muhamadin R C , Ramadan M B , Qudus A RA , Siregar J P 
Published: February 2022

Abstract
Biocomposite is a material that have potential to heal injured bones and teeth due to their biocompatible, non-toxic, non-inflammation, and bioactive properties which can prevent infections that occurs frequently during surgical processes. Biocomposites made of PLA, PCL, and HA from bovine bone as a substitute for metal materials in medical applications have been widely studied. However, there are limited studies on the biocomposites made of PLA, PCL, and HA from green mussel shells. Therefore, this study aims to produce biocomposites from Polylactic Acid (PLA), Polycaprolactone (PCL), and Hydroxyapatite (HA) from green mussel shells and to determine the effect of HA concentration on the mechanical properties and degradation rate of the resulting biocomposite. 80 ml of chloroform was used to dissolve 16 grams of a PLA/PCL mixture with a composition of 80% and 20%. After 30 minutes, the solution was agitated for 30 minutes with a magnetic stirrer at 50°C and 300 rpm. After obtaining a homogenous solution, hydroxyapatite was added in percentages of 5%, 10%, 15%, and 20% of the total weight of the PLA/PCL mixture. The resulting mixture is poured into a glass mold in accordance with ASTM D790. Three-point bending, density, and biodegradable test were performed to investigate the effect of HA content on the mechanical properties and degradation rate of the biocomposite. The results of this study indicate that the mechanical properties of the biocomposite improved with the HA concentration increases. However, the more HA content used, the faster the biocomposite degrades.
Optimization of the pH of mosquito repellent from citronella using response surface methodology
Authors: Handayani P A , Hartanto D , Eden W T , Anyelir D F , Salsabila G R H H 
Published: February 2022

Abstract
Citronella is a source of essential oil obtained from steam distillation. The production of citronella oil is quite high; therefore, it can be applied in various fields. One of its applications is as an active substance in mosquito repellent creams. The citronella oil used in this study contained 11.59% citronellol content at a retention time of 16.544 minutes and citronellol content of 14.78% at a retention time of 27.165 minutes using the Gas Chromatography Mass Spectrometry method. In the manufacture of mosquito repellent creams, there are still mismatches in the composition between variables, so there is a need for optimization in this study. Optimization in this study using Response Surface Methodology model Central Composite Design on Statistica 10 software with 19 treatments. The method used was the addition of independent variables, citronella oil (2-4%), stearic acid (10-16%) and cetyl alcohol (4-6%) processed using the RSM-CCD method to determine the optimum pH. Optimization results with RSM at pH resulted in optimum conditions for citronella oil content of 2.1591%, stearic acid 18.045% and cetyl alcohol 6.6818% with a pH of 6.1.
Evaluation of 35 kWp on grid solar power plant based on economic and environmental factors in ESDM office Jawa Tengah, Indonesia
Authors: Sunardiyo S , Winarsih T 
Published: February 2022

Abstract
The existence of Solar Power Plant is very much needed in supplying clean, cheap and sustainable electricity. New renewable energy power plants are very important to replace power plants that use fossil fuels. Therefore, it is necessary to evaluate the performance of Solar Power Plant that is how much the operational costs and how much CO2 emissions can be reduced. This study describes an investment feasibility assessment or economic analysis using the calculation of NPV (Net Present Value), PI (Probability Index) and DPP (Discount Payback Period) and environmental analysis, that is knowing the amount of CO2 emission reduction from the use of Solar Power Plant analysed using criteria according to IPCC standards (Intergovernmental Panel on Climate Change). The research location of Solar Power Plant on Grid 35 KWP Office of the Energi and Sumber Daya Mineral (ESDM), Jawa Tengah, Indonesia. The results of this study indicate that the NPV of this PV mini-grid > 0 is Rp. 3,331,537.-PI, 1.0039, DPP 24 years 6 months and Payback Period 8.74 years, which means this investment is feasible to continue. Meanwhile, the CO2 emission that can be reduced is 44.718.42 kgCO2/year. These results indicate that Solar Power Plant on Grid 35 KWP the ESDM office location in Central Java is feasible and profitable from an economic and environmental criterion.
Data warehouse capability maturity model assessment for efficient monitoring process: a case study in National Narcotics Board
Authors: Fahmi  , Hidayanto A N , Solikin  , Indriany H S , Prastya A , Mardiansyah S F 
Published: February 2022

Abstract
Data Warehouse/Business Intelligence nowadays has become a necessity for every organization. Data analysis supports in making decisions and policies. The problem is the data warehouse management process, both related to ETL, data modelling, and data architecture, which results in the non-optimal and inefficient dashboard that wastes energy, as a data monitoring tool in displaying important information needed by the organization. This research was conducted by providing an assessment to the working group team in the data warehouse section using the Spruit & Sacu Data Warehouse Capability Maturity Model (DWCMM) to measure the maturity of the data warehouse at the National Narcotics Board. The results showed that the DWCMM maturity level is at the repeatable level, from the measurement results it can be seen that the worst DW category is in the Service Processes component so that many improvements need to be made to increase the DWCMM maturity level. As a recommendation, it is necessary to design a virtual integrated DW architecture that has real-time updates, data quality system, automatic synchronization of data modelling, standardization of metadata, realtime ETL monitoring management, closed-loop & BI real-time BI application, and improves the development process and process services in the management of DW/BI at BNN to become more efficient.
Post occupancy evaluation for green building certificated (case study UGM law centre building)
Authors: Nugradi D N A 
Published: February 2022

Abstract
Green building has recently become the main approach in the construction of a building, including in Indonesia. A building that has been certified as a green building does not mean that it has all the components that meet the requirements of comfort, health and safety, especially if the main goal for certification is to pursue energy efficiency in buildings. The purpose of this study is to describe the level of user satisfaction of the UGM Law Learning Center building after the building is certified as a green building. This type of research is a post-occupancy evaluation (POE) in the form of survey research with a quantitative descriptive approach. The steps to be taken are: identification of building performance based on the EDGE instrument, identification of building data, interviews, observations, data search through questionnaires, quantitative descriptive analysis. The results of the study indicate that, in general, the spaces in the building have met the activity needs and user comfort, but there are several aspects that need to be improved, namely: visual comfort, cleanliness, and spatial efficiency.
Redesign Gajah Mungkur park in Semarang City as public space and green open space with using the concept “hidden layer of Semarang”
Authors: Wicaksono D , Pratiwi I , Wibowo A A 
Published: February 2022

AbstractCity parks, as open spaces in metropolitan environments, are well suited to serve as a gathering place for city inhabitants to engage in a variety of valuable activities, purposes, and interests. The presence of open space is a crucial factor in a city’s ability to preserve its ecological sustainability. Gajah Mungkur Park is one of the quite shady parks in the Candi area of Jl. S. Parman, Semarang City. Gajah Mungkur Park is unique and has the potential to become a tourist destination, particularly in support of Semarang’s “Green City”. Actually, Gajah Mungkur Park belongs to the City Government, there are several obstacles faced, the park area has not been arranged, there are no adequate facilities, irregular street vendors, difficult road access, irregular parking areas, limited parks and lack of attention from the government. This service method is carried out with primary and secondary literature studies, observations, data collection, and interviews to strengthen, empower, direct the community or stakeholders to optimize the management of park potential and the environment at Taman Gajah Mungkur. In redesigning Gajah Mungkur Park, the concept of “Hidden Layer of Semarang” is used, namely some details of the arrangement concept ideas that will be applied (1) Vegetation Boundary, the concept of vegetation as a hidden layer which also functions as a buffer for air pollution and vehicle noise, (2) Refurbishing – Revitalize, restore the function of the City Park and take advantage of the existing functions of towers, wells and culinary stalls, (3) Multi-Activity, offering various activities for visitors such as leisurely walks, jogging, family and neighbor gathering areas, (4) Pedestrian Engage, providing more access for pedestrians by providing parking space for vehicles with a proportional ratio, (5) Centralized Plaza, proposes a sunken plaza design concept in the form of an amphitheatre as a center of activity. From the concept of “Hidden Layer of Semarang” where the new garden design is expected to contribute to green open spaces in Semarang. Physical implementation of this concept, this park will be hidden and surrounded by vegetation so that the facilities can be enjoyed by the community when they are in the park. As a result, in order for these activities to be used maximally and sustainably, it is required to build appropriate garden landscape design and strengthen community groups through them.
Study on pavement performance of cotton straw cellulose modified asphalt
Authors: Li Zhenxia , Guo Tengteng , Chen Yuanzhao , Liu Jinyuan , Ma Junying , Wang Jing , Jin Lihui 
Published: February 2022

Abstract
To improve the pavement performance of heavy traffic asphalt pavement, two modifiers, cotton straw powder and cotton straw cellulose, were added to matrix asphalt. Through the tenacity test, dynamic shear rheological test, multi-stress creep recovery test and bending beam rheological test of asphalt, the tenacity, high temperature properties, viscoelastic properties and low temperature properties of three kinds of asphalt, including matrix asphalt, cotton straw powder modified asphalt and cotton straw cellulose modified asphalt, were evaluated. Scanning electron microscopy and synchronous thermal analyzer were used to analyze the microstructure and thermal stability of modified asphalt. The results show that both cotton stalk powder and cotton stalk cellulose can effectively improve the tenacity, temperature sensitivity and rheological properties of asphalt. The comprehensive improvement effect of 1% cotton straw cellulose is the best, but its low temperature performance has not been improved significantly. Cotton straw cellulose and asphalt form a more stable system, thereby improving the stability of asphalt. The increase of asphaltene content and the decrease of aromatic content are due to the good oil absorption of cotton straw cellulose, and the high temperature performance of asphalt is improved.
Determination of shift factor for long-term life prediction of carbon/fiber epoxy composites using the time-temperature superposition principle
Authors: Cha Jaeho , Yoon Sungho 
Published: February 2022

Abstract
This study presents the way to determine the shift factor for predicting the long-term behavior of a carbon fiber/epoxy composite using the time-temperature superposition (TTS) principle. We conducted the multi-frequency, creep TTS, and stress relaxation TTS tests and obtained the dynamic mechanical analysis responses such as the storage modulus, creep compliance, and relaxation modulus. A shift factor determining the data movement is essential in creating the master curves. The shift factor was estimated using several methods such as the Arrhenius equation, William–Landel–Ferry equation, and manual shift method. The change in viscoelastic properties over a wide range of time was investigated by comparing the master curves to determine the most rational approach for estimating the shift factor. The master curves were obtained from the three methods based on the storage modulus. For the Arrhenius equation, the smooth master curves could not be obtained when applying a constant activation energy value. Still, using two activation energy values for the carbon fiber reinforced composite, the smooth master curves could be obtained. However, the manual shift method could get the master curves that overlap smoothly in the creep TTS and stress relaxation TTS, even without calculating activation energy values. Since the proposed procedure can estimate the long-term viscoelastic properties reasonably, the life span of the structure can be predicted at the design stage by using the master curves considering the viscoelastic properties.
Nested cycles with no geometric crossings
Authors: Fernández Irene , Kim Jaehoon , Kim Younjin , Liu Hong 
Published: February 2022

In 1975, Erdős asked the following question: what is the smallest function

f
(
n
)

f(n)

for which all graphs with

n
n

vertices and

f
(
n
)

f(n)

edges contain two edge-disjoint cycles

C
1

C_1

and

C
2

C_2

, such that the vertex set of

C
2

C_2

is a subset of the vertex set of

C
1

C_1

and their cyclic orderings of the vertices respect each other? We prove the optimal linear bound

f
(
n
)
=
O
(
n
)

f(n)=O(n)

using sublinear expanders.