bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interpretation of gravity satellite data to delineate structural features connected to geothermal resources at Bur Ni Geureudong geothermal field
Authors: Putri D R , Nanda M , Rizal S , Idroes R , Ismail N 
Published: December 2019

Abstract
The gravity method is broadly used in analyzing potential geothermal studies. The method can be used for determining potential areas, reservoir locations, and geological structure investigation. In this paper, satellite gravity data was applied for better understand the geological conditions connected with the geothermal system of Bur Ni Geureudong geothermal field, Bener Meriah District, Aceh, Indonesia. Open access Free Air anomaly data were provided by satellite geodesy information with 1 minute-grid. The data were reduced to obtain Bouguer anomaly distribution in the study area. Tilt derivative (TDR) technique was applied to Bouguer anomaly to enhance linear trends of geological structures. The aim of this analytical technique is able to clearly display faults correlated with geothermal manifestations around the Bur Ni Geureudong geothermal field. The complete Bouguer anomaly range of 20 mGal up to 170 mGal covers Bur Ni Geureudong volcano complex. A low Bouguer anomaly is located in all summits of volcanoes that are included in Bur Ni Geureudong Volcano Complex; those are summits of Bur Geureudong volcano, Bur Ni Telong Volcano, Pepanji Mountain, and Salah Nama Mountain. The low Bouguer anomaly is associated with the andesitic flow and volcanic ashes. The higher Bouguer Anomaly is reflected in high-density basement rock in the west of Geureudong Volcano. Tilt derivative (TDR) shows geological structures more detail, particularly, the tilt derivative (TDR) clearly detects two fault structures over the study area presented by a tilt value of zero. The results will be useful as basic information in exploration study of Bur Ni Geureudong geothermal field.
Preliminary study of bioethanol production by Saccharomyces cerevisiae BTCC12 utilizing hydrolysis products of Dioscorea hispida tubers
Authors: Irmayadani  , Iqbalsyah T M , Yopi  , Febriani  
Published: December 2019

Abstract

Dioscorea hispida is an underutilised plant despite its high carbohydrate content. This study used D. hispida starch as the raw material for bioethanol production by employing Separated Hydrolysis Fermentation (SHF) technique. Initially, the starch was used as the sole carbon source for Aspergillus awamori KT-11 to produce amylases. The optimum enzyme activity (7.4 U/ml) was observed at 96 h fermentation. The enzymes were further used to hydrolyse D. hispida starch. The optimum condition for the hydrolysis was achieved at 6 h when using a mixture of starch and enzyme with a ratio of 1:6 (w/v). Thin-layer chromatography results showed that the main hydrolysis product was glucose. The hydrolysates were then used by Saccharomyces cerevisiae BTCC12 as the medium for bioethanol fermentation. HPLC analysis showed that the optimum ethanol concentration was 0.37 g/L after 6 h fermentation while the reducing sugar concentration was only 2.9% of the initial. The results provide a solid basis for further studies to optimise bioethanol fermentation utilising D. hispida as the substrate.
Utilization of banana peel waste for citric acid production by Aspergillus niger
Authors: Khairan K , Makstum A , Yulvizar C 
Published: December 2019

AbstractThe potential of Banana peel waste of Pisang Ayam (Musa acuminata), Pisang Raja (Musa Paradisiacacv. Raja genom AAB), and Pisang Nipah (Musa balbisiana) as substrat for citric acid production byAspergilus nigerhave been investigated. The main purpose of this research was to determine the percentages of citric acid production, pH, and total biomass at differences of media of banana peel waste. The results showed that the percentages of citric acid production using media ofMusa acuminata, Musa Paradisiacacv. Raja genom AAB andMusa balbisianawere 58.80, 69.84, and 46.80% respectively. The pH values of each media were 2.50, 1.50, and 2.0 respectively. The results also founded that the total biomass of each media were 2.442, 2.649, and 2.407 respectively. Overall, the results showed that banana peel waste ofMusa Paradisiacaproduce the highest amount of citric acid after 240 h fermentation.
Analysis of Yellowfin Tuna (Thunnus Albacares) fisheries management in the waters of North Aceh
Authors: Aprianty  , Indra  , Sofyan  
Published: December 2019

Abstract
This study describes bioeconomic analysis of resource utilization yellowfin tuna on various management regimes through Gordon Schaefer’s Model with Fox algorithm biological parameter estimation model. The purpose of this study was to analyze the biological and economic aspects of the level of utilization of yellowfin tuna resources. The study was conducted at the Kutaraja Fishing Port in Banda Aceh by survey method. The results showed the intrinsic growth (r) was 0.87607 tons per year, the catchability coefficient (q) was 0.00016 tons per year, the carrying capacity was 6.873.10 tons per year, the cost (c) was 17.55 million per trip (IDR) and price (p) is 34.94 million per ton (IDR). Based on these parameters, the management regime at the time of MSY obtained the production level (h) of 1.505.33 tons per year, the effort amounted to 2,771.58 trips per year and the economic rent (π) of 3,955.15 billion per year (IDR). In MEY conditions, the production rate (h) is 1,183.48 tons per year, the effort is 1,490.01 trips per year, and the economic rent (π) is 15,199.41 billion per year (IDR). In the condition of management of open access production (h) is 1,496.82 tons per year with an effort of 2,980.03 trips per year and economic rent of 0 (IDR). The static parameter analysis shows that the utilization of yellowfin tuna in North Aceh waters is economical overfishing and biological overfishing.
Energy dependence of Cl emission lines in CO2 laser induced breakdown spectroscopy
Authors: Sari A M , Lahna K , Idris N , Ramli M , Kurihara K 
Published: December 2019

Abstract
Chlorine (Cl) detection using laser induced breakdown spectroscopy (LIBS) techniques in geology and environment samples is still challenging since the experimental conditions greatly influence the analytical performance of LIBS. Cl emission in LIBS must be studied carefully to find the optimum condition to allow Cl detection. In the present study, Cl emission was studied from polyvinyl chloride (PVC) sample containing Cl as major element. A Transversely Excited Atmosphere (TEA) carbon dioxide (CO2) laser was used for inducing plasma from the sample. Cl emission was investigated by varying the experimental conditions, especially energy of the laser pulse. The emission spectrum from the consequent plasma was detected using an Optical Multichannel Analyzer (OMA) system. It was found that Cl emission lines only can be obtained when helium was used as the surrounding gas. The strongest emission line of Cl I 837.59 nm in the infrared region cannot be detected even under helium surrounding gas. Instead, many ionic emission lines of Cl in ultraviolet regions including the strong ionic lines (Cl II 479.45 nm, Cl II 481.00 nm, Cl II 481.94 nm and the weak lines (Cl II 476. 86 nm, Cl II 478.13 nm, Cl II 489.67 nm, Cl II 490.47 nm and Cl II 491.77 nm) can unequivocally be detected. It was also found that the intensity of Cl emission lines critically depends on the energy of the laser pulse, namely the emission intensity of Cl lines increases sharply with energy. In present work, the highest intensity of Cl emission lines was obtained when the energy of the laser pulse was about 2500 mJ, giving strong and clear Cl emission lines with low background and relatively high signal to background ratio of more than 3.
Experimental investigation of a cold storage box with Aceh locally produced hydrated salt as phase change materials: effect of salt treatment
Authors: Gunawati  , Noor N , Sebayang K , Setiawan A 
Published: December 2019

Abstract
This investigation aims to study heat transfer rates and temperature changes within a 5 litter cold box enveloped with water-salt solution as phase change material (PCM). The study begins with design and fabrication of a cold box followed by performance tests. Salt sample was collected from a traditional producer in Aceh Besar District, Indonesia. In order to understand the effect of pre-treatment, some of samples were heated at 400 and 600°C for 30 min and compare it with those untreated. Salt solution of each samples was prepared by adding 10 wt.% of salt into water and filled into eight PCM bottles. PCM charging procedure was performed in a refrigerator for 12 h. By placing eight bottle of PCM into the cold-box, thermal energy discharging process was monitored by using four thermocouples. The changes in temperature were recorded for eight hours. In general, result shows that pre-treatment of salt results in a positive effect on thermal energy storage capacity. The best performance of cold storage system was exhibited by PCM made of salt treated at 600 °C where the rate of temperature change within eight hours experiment is 0.055 °C/min.
Analysis of temperature and column variation in gas chromatography to dead time of inert gas and n-alkane homologous series using randomized block design
Authors: Idroes R , Husna I , Muslem  , Mahmudi  , Rusyana A , Helwani Z , Idroes G M , Suhendra R , Yandri E , Rahimah S , Sasmita N R 
Published: December 2019

Abstract
The dead time behavior from several inert gas and mathematical methods under temperature and column variation have been studied using randomized block design. Dead time of inert gas and mathematical dead time calculated using n-alkane homologous series that measurement with gas chromatography at temperatures of 60, 90 and 120°C and columns of PS-255, OV-11, CPSIL-5CB, HP -5 and HP-INNOWAX were used as a set data in randomized block design. The results showed that temperature variation affects all dead time values, either for inert gas dead time or mathematical method, except for Parcher method. Different column types between capillary and packed column exhibits a significant effect. For capillary column, all dead time values, either for inert gas dead time or mathematical method is not affected by polarity variation, but they are affected by the column length. Meanwhile for packed column, column length does not affect the mathematical dead time of Ne and He gases, but it affects the dead time of O2 and Ar gases. Parcher method exhibits the best result with a robust dead time, without significant effect in statistics by the change of temperature and column.
Antioxidant and cytotoxic activity of ethyl asetat extracts of cocoa pod husk (Theobroma cacao L)
Authors: Umri R J , Maulana I , Ginting B 
Published: December 2019

Abstract
Isolation of ethyl acetate extract from cocoa pod husks (Theobroma cacao L) and testing of their cytotoxic as well as antioxidant activities has been done. The cytotoxic activities test has been carried out employing Brine Shrimp Lethality Test (BSLT) method, while the antioxidant activities test was employing l,l-diphenyl-2-picrylhydrazyl (DPPH) and vitamin C as positive control. In the cytotoxic test, all fractions showed excellent cytotoxic activity with a range of LC50 = ∞ ppm to 107.15 ppm. The extract also showed antioxidant activity with IC50 = 163.35 ppm and vitamin C = 0.014 ppm. Isolation of the active components of ethyl acetate extract using silica gel as stationary phase and n-hexane:ethyl acetate (9:1) eluent, yielded a combination of 9 fractions (TCE1-TCE9). The separation of TCE 5 produced white needle crystals with a melting point of 128 - 131°C. Based on the stain pattern, the crystal belongs to a phenolic compound.
Mud-puddling behaviour of butterflies in the Soraya research station, district of Subulussalam, Aceh, Indonesia
Authors: Suwarno S , Rasnovi S , Utami S D , Rizki A , Dahelmi D 
Published: December 2019

Abstract
Butterflies, mostly the male congregate and uptake the sodium and amino acids from the mud, dung, and urine of mammals or decaying flesh and then transferred to the female during mating. This behaviour is usually called as puddling. Hence, the objective of the present study was to identify the puddle butterflies in the Soraya river banks, their sex and age ratio. Five sampling points were observed for three hours (09:00-12:00 am) during 5 d each. The number of individual and number of species of butterflies that do puddlings were observed. A total of 25 species of butterflies belonging to four families were identified. Appias lyncida and Graphium sarpedon were the most active in puddling followed by Caleta elna, Pathysa antiphates and Appias lybithea. Generally, butterflies that do puddle were the male and the young individual.
Model of virus therapy and chemotherapy for cancer
Authors: Safitri E , Tarmizi T , Ramli M , Wahyuni S , Ikhwan M 
Published: December 2019

Abstract
This article discusses the mathematical model of changes in the number of cancer cells as a result of the intervention. Here the effect of combination treatment, in the form of virus injection and chemotherapy on tumor cells, is presented in detail. There are two different tumor cells, uninfected tumor cells and infected tumor cells. Model simulations with different parameters were performed for 700 d. The initial values for the population of virus-infected tumor cells are divided into two categories. The number of tumor cells injected with the virus is ½ (half) and all tumor cells that are not infected. Based on the simulation results, it was concluded that the more the number of tumor cells injected with the virus, the faster the decrease in the number of tumor cell populations. It was also concluded that the reduced population of tumor cells reduces the amount of chemotherapy concentration used.
Online Taxi bike To Create Informal Public Spaces in Urban Areas
Authors: Kurniawati W , Islamey T Z 
Published: December 2019

Abstract
The changes associated with digitalization, are rapidly messing up the old pattern, leading to the creation of a new system. The expansion of technological applications such as Uber or Gojek, leads to the development of a unique transportation model thereby, creating informal parking spaces for online taxi bike drivers. These spaces are self-formed, random, not formally planned, and located at strategic locations to suit the needs of users. In order to explore the phenomenon of informal public space, this research conducts the following: 1) Traces online taxi bike; 2) Identifies its potentials and problems; 3) Analyses the spatial pattern; and 4) Figures out the pattern and its impact. Data was obtained by direct observation in Diponegoro University, Tembalang, Semarang. This research therefore aims to understand the existing conditions faced by the new paradigms in Indonesia. The result is a spatial interaction pattern of informal space due to online taxi bike activities, such as T-junction, and under trees spot, with digital technology used to scrub the problems associated with driving forces.
Organism Associated with Cymodocea Serulata in Different Habitats near Urban Coastal Area
Authors: Watiniasih N L , Nuarsa I W , Merdana I M , Budiarsa I N , Dharma A , Antara I N G , Poborini M W 
Published: December 2019

Abstract
The development of tourism in Bali is very rapid, where most area are in direct contact with residential areas. Seagrass that grows in coastal area is under pressure due to tourism activities. This study aims to determine the state of urban coastal areas with an indicator of organisms associated with seagrass Cymodocea serulata. The samples of C. serulata leaves were collected from Sanur Beach, Denpasar and Samuh Beach, Nusa Dua, Badung, Bali. These two areas are tourism areas with high tourist visits, and are located near the residential areas. Sanur Beach is different from Samuh Beach, where the seagrass habitats at Sanur Beach are also used as a mooring place for motorized boats, crossing Penida strait from Sanur to Nuas Penida and Nusa Lembongan. The results showed that periphyton that lived in association with C. serulata were higher at Samuh beach (12 species) compared to Sanur beach (3 species). However, the total bacteria associated with seagrass leaves was higher at Sanur beach (58. 0 × 104 CFU / mL) compared to that of Samuh beach (51.3 × 104 CFU / mL). Three species of periphyton with the high number of individuals found on C. serulata leaves at Samuh beach were Ardissonia fulgens, Synedra sp, and Thalassionema nitzschioides, while 3 species were found at the Sanur beach were Thalassiothrix sp, Oscillatoria sp. and Paracalanus palvus. Four potential fungal species were found associated with seagrass leaves, 3 of them identified as Aspergillus eff. niger, A. clavatus and Penicillium purpurogenum, while 1 isolate has not been identified. The results of this study found that habitat differences and water designation affected the diversity of organisms associated with seagrass beds of C. serulata.
Sustainable Communities as a Response to Climate Change: Analysis of Geroldsäcker Eco-Housing Project and Recommendations for its Replication Considering Current Urban Challenges
Authors: Kasih B , Nohara K , Zerbst L , Javier R 
Published: December 2019

Abstract
Geroldsäcker eco-housing is a unique project located in the northeast of Karlsruhe, in a 1.24-hectare plot with constructed area of 5.600m2. The planning of the project started in year 1989 and its completion happened in 1992. It is composed of 40 residence units: apartments and 3 store row-houses with private garden. The initial concept was an ecological settlement with common infrastructure and spaces for human interaction, using constructive ecological materials and devices for the residences and common areas. The community living sense is one of this project’s highlights. The 120 residents not only share common spaces, such as a community house destined to events and practice of activities, but also developed task groups to cover all necessary workspaces in the settlement. What can be observed nowadays is that Geroldsäcker, even being implemented 3 decades ago, presents several important sustainability aspects in the ecological, social and economic dimensions. What started as a pilot project at a time when the definition of sustainability was still under discussion, can be considered a model not only of sustainable housing, but also as a broader model for sustainable communities. This paper explores the aspects identified in Geroldsäcker eco-housing project leading towards a sustainable community concept. Potentialities and improvement points are analysed, considering current urban challenges, such as high demand and costs for land, lack of public land for experimental projects, efforts to stimulate bottom up processes, the behaviour of current generations, the need for new and environmental friendly constructive patterns, and how to aggregate stakeholders to boost new models of sustainable communities projects.
Coworking Space and Cluster Spatial Relations in the Context of Jakarta City Spatial Structure
Authors: Huliana W , Ellisa E 
Published: December 2019

Abstract
Y generations, or better known as the millennials, are currently the most significant addition in work place. Globalization and industry 4.0 development are the biggest external factors that shaped their character. Both of them has changed the way millennials live as a part of the society. This characters are reflected in the work place in a form of collaborative work. It is becomes the main reason why coworking spaces are now a global trend. Coworking spaces exist as a manifestation of millenials adaptation in occupying work place. With its shared-knowledge based system as the main concept, coworking spaces need a certain proximity with one another. It has an impact on coworking spaces distribution that tends to concentrated in a certain area, particularly in existing industrial cluster. This phenomenon is often called agglomeration economies or spatial clustering. The emergence of coworking space and the phenomenon of agglomeration are most likely occured simultaneously in urban environment. It is also occurred in Jakarta. However, it is still in its early development compared to Silicon Valley. Reflect on that successful cluster and based on current development studies on agglomeration economies, this paper will discuss about coworking space and cluster agglomeration process, relation, and potential capacity which will be integrated with Jakarta spatial structure current condition. The results will indicate the city structure adaptation towards cluster development and give depiction to foresee its future development possibilities.
Hydroponic Plants Monitoring System based on Single Board Computing in Order to Increase Food Security in Bali
Authors: Mogi I K A , Dharma A 
Published: December 2019

Abstract
To optimize agricultural yields on increasingly shrinking agricultural land in Bali, hydroponic cultivation is the solution. Compared to conventional planting, hydroponic planting uses different methods. This method causes one disadvantage in hydroponic planting. The weakness is the skill of farmers in monitoring their crops. To help farmers monitor their hydroponic plants, a system is needed. The system should be able to monitor and inform farmers about the condition of their crops. This study designed and built a hydroponic plant maintenance system using a single board computer, microcontroller, sensor, and actuator. The microcontroller is used to collect data from sensors. Next, the data is forwarded to a single board computer to be processed into information. The information will be forwarded and stored into the server, and then continued to the farmers concerned through smartphone devices which are connected to the internet. Then, the farmers make decisions according to the information. On this system, a single board computer, microcontroller, sensor, and actuator are in a local connection. Single board computer that is connected to the internet in such a way, that it is able to transmit data to the farmers’ smartphone devices. The communication between single board computer and microcontroller is using web services based on JSON-RPC, and from the single board computer to the farmer’s devices is using web services with the REST architecture. The conclusions from this study are the system built is able to monitor the hydroponic plants and inform the farmers using their smartphone.
Effect of Weather for Demand of Online Transportation in Tembalang, Semarang
Authors: Rakhmatulloh A R , Dewi D I K , Wijayanti  , Winarendri J 
Published: December 2019

Abstract
Estimates of online transportation users in an area need to be known because it can be used to analyze how much the dependence of the traveler on online transportation. So that it can be seen how the travel patterns of online transportation users. However, research on the impact of weather variables on the selection of modes of online transportation has not been widely implemented. This study aims to evaluate the influence of the weather by entering dry season and rainy season variabel related to daily travel behaviour on online transportation. This research was conducted at Tembalang Semarang, and the target of respondents was students. The analytical results show that, in general the existence of rainfall is associated with a certain degree of online transpotation user of go car/grab car increase. So we can conclude that weather-related variables were found to routine/daily trips.