Indonesia Conference Directory

Corresponding Author
Rika Diananing Putri

Institutions
a*) Agricultural Product Technology, Faculty of Agriculture, Universitas Wiraraja. Jl. Raya Sumenep-Pamekasan KM. 05, Sumenep, East Java 69451. *amiliadestryana[at]gmail.com
b) Agribusiness, Faculty of Agriculture, Universitas Wiraraja. Jl. Raya Sumenep-Pamekasan KM. 05, Sumenep, East Java 69451

Abstract
Sumenep regency is one of salt centers in Indonesia. The problem that experienced by farmers is production process of salt and the low price, caused by worse business management. Salt is potential coomodity, because salt market is still wide open especially for industrial salt. This research aims to develop the salt production method and development strategy of salt business in Sumenep Regency by using SWOT analysis. The result of the analysis concludes that the priority of salt development business strategy in Sumenep Regency are: a) Geo-isolator technology application strategy to produce good quality of salt; b) cooperation strategy in group mechanism to build power and increasing the bargaining value of the farmers; c) capital strengthening strategy through partner cooperatives; d) broader marketing management management strategies to industrial salt user sectors.

Keywords
Development, Strategy, Production Method, Salt, Sumenep

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/yQAXL47mrbvz

Corresponding Author
Desi Widyaningsih

Institutions
1. Center for Research and Development on Energy and Electricity, Hasanuddin University,
Makassar 90245, Indonesia

2. Department of Electrical Engineering, Hasanuddin University, Gowa 92119, Indonesia
*desiwidyaningsih.dw[at]gmail.com

Abstract
Lightning strikes are one of the main causes of power outages that can produce dangerous condition cause power supply disruptions which cause damage to electrical equipment. This study investigate backflash over uses the electricity system in Southern Sulawesi by considering the integration of 150kv substations of Sengkang LNG and one wind power plants. Because of the integration plan, therefore it is necessary to analyze the impact of lightning strikes. This research will be simulating lightning strikes by modeling and analyzing fluctuations during interference.

Keywords
transmission, lightning strike, backflashover

Topic
Smart Grid Technology

Link: https://ifory.id/abstract/hfXJANHvFnMq

Corresponding Author
Iryanto Iryanto

Institutions
1 Informatics Department, Politeknik Negeri Indramayu, Indonesia.
2 Industrial and Financial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia.

Abstract
In this research, we develop mathematical model to investigate the effectiveness of embankment and vegetation on the reduction of wave run-up. We solve the model numerically using a staggered finite volume method. Wave run-up test on a sloping beach is conducted to show the accuracy of our numerical scheme. In this case, we compare our numerical results with results of laboratory experiment of Synolakis in 1987. Further, sensitivity analysis is presented to see the effect of the characteristic of the structures.

Keywords
Wave run up, staggered finite volume, overtopping, wave mitigation

Topic
Mathematics

Link: https://ifory.id/abstract/QzpqjMnLNJZ8

Corresponding Author
Ayu Suci Wulandari

Institutions
a) Department of Pests and Plant Diseases, Faculty of Agriculture, Universitas Gadjah Mada Jln. Flora No.1 Bulaksumur, Sleman 55281, Yogyakarta, INDONESIA.
*ayuwulan797[at]gmail.com
b) Agrotechnology Innovation Centre (AIC), Universitas Gadjah Mada Jln. Tanjung Tirto, Kalitirto, Berbah, Sleman, Yogyakarta 55573, INDONESIA.

Abstract
Plant parasitic nematodes is one of the most prominent kind of pests in garlic which be able to cause large losses in agricultural production. The development of parasitic nematodes is influenced by various factors, including abiotic factors. The research was carried in sub-Laboratory Nematology, Department of Pest and Plant Diseases, Faculty of Agriculture, Universitas Gadjah Mada from January to June 2019. This study aims to determine three things: the types of parasitic nematodes in garlic at various elevations, the effect of abiotic factors on the abundance of parasitic nematodes in garlic, and the diversity and dominance of parasitic nematodes in garlic at various elevations in Central Java Province. Sampling was carried out in four cities: Brebes, Magelang, Tegal and Temanggung, in which all are locate in Central Java and the elevation are measured using the Geograpichal Positioning System (GPS). The isolation-Extraction of nematodes from soil samples was carried out using a modification of the whitehead tray method, while the isolation-extraction of nematodes from plant tissues (roots and tubers) was carried out by incubation method. Data were analyzed using a correlation test and regression to determine the relationship between pH, temperature, C-organic and C/N ratio with the population abundance of parasitic nematodes. The analysis was conducted using Ms. Excel. Diversity of parasitic nematodes garlic in various elevations were analyzed using the Index Shannon-Winner. The results showed that there were five parasitic nematodes genera in garlic, namely Ditylenchus sp., Helicotylenchus sp., Hoplolaimus sp., Rotylenchulus sp., and Pratylenchus sp.. The symptoms of garlic infected with parasitic nematodes include tubers experiencing discoloration to dark, nearly black; yellowing on the leaves; stunting of plants; and rolling leaves. Abiotic factors such as temperature has a positive influence on the abundance of Helicotylenchus sp., pH has a positive influence on the abundance of Pratylenchus sp., C-organic and C/N ratio has a positive effect on the abundance of Pratylenchus sp.. The diversity index of parasitic nematodes in garlic at various elevations is relatively low, ranging from 0,90-1,36. The dominance of parasitic nematodes in garlic at various elevations varies at the elevations >1600 masl, 1201-1400 masl and <1000 masl, the dominating parasitic nematodes are Ditylenchus sp., at elevations 1401-1600 masl, the predominant parasitic nematodes are Helicotylenchus sp., and at the elevation of 1000-1200 masl, the dominating parasitic nematodes are Pratylenchus sp..

Keywords
abiotic factors, elevation, garlic, parasitic nematodes

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/pGvRejg42XCB

Corresponding Author
Harsa Wara Prabawa

Institutions
Universitas Pendidikan Indonesia

Abstract
Learning process in Vocational High Schools (SMK) has different characteristics from public schools which is more focused on productive subjects or practices. This condition is a particular obstacle, especially if students are confronted with material that tends to be conceptual, such as a Computer System. Computer System Material is material that studies the concepts of mathematical calculations that occur in the computing process. The inaccuracy of student knowledge on the basic concepts of Computer Systems will have an impact on the mastery of the material in other learning. This study tries to develop a learning type of simulation type because theoretically simulation is considered more effective in helping students with high levels of anxiety in understanding a topic because it presents a series of contextual objects/content that demands student involvement in conducting experiments. This simulation media was tested on 84 Vocational High School students in the IT field in several schools in the city of Bandung. From three times of media testing, the results are obtained that the simulation media can make students better understand the concept of abstract logic material because the material is visualized by simulations on electric circuit illustrations that are made as if the user is in a real situation. Nevertheless, the simulation media still need to be improved, especially in terms of the scenario of the presentation of the exercise and the complexity of the cases presented.

Keywords
Simulation, logic gate, computer system

Topic
Computer Science Education

Link: https://ifory.id/abstract/yLrPX2kwJAfD

Corresponding Author
Nadiyah Faizi Polontalo

Institutions
a) Chemical Engineering Department, Faculty of Engineering, Diponegoro University, Indonesia
b) Center of Biomass and Renewable Energy (C-BIORE) Diponegoro University, Indonesia
*) corresponding author: hadiyanto[at]live.undip.ac.id

Abstract
The increasing of human growth in Indonesia every year might cause the increasing demand for electricity. Electricity demand in Indonesia is estimated to continue to grow by 4.6% per year. Fossil fuel especially coal, plays an important role in electric steam power plant in Indonesia, which reaches 48% of total domestic capacity. However, the availability of coal as raw material will continue to decline because it requires a long time to be renewed. Other alternative energy is needed to fulfill the energy supply. One of the environmentally alternative energies that can be solved this problem is the microbial fuel cell (MFC) which utilizes organic matter (substrate) as an energy source of bacteria in carrying out its metabolic activities to produce electricity. This system utilizes waste water as a substrate so that it can be used as an ideal tool for electricity production. In this study, we investigated the electrical energy produced by MMFC (Microalgae Microbial Fuell Cell) using microalgae Chlorella vulgaris and batik waste (Figa Batik Collection) in Semarang. This study aims to evaluate the performance of the MMFC system based on the influence of yeast variations (8 gr/l and 2 gr/l), the concentration of batik waste (50% and 100%), and the number of graphite electrodes (1:1 and 2:2). The experiment starts from culturing Chlorella vulgaris until it has an absorbance closer to one. Then, a series of MMFC systems is carried out where the anode chamber is filled with 1 litre of batik waste and the cathode chamber is filled with 1 litre of Chlorella vulgaris. MMFC simulation is operated for 7 days, then every 24 hours the next voltage and current are measured to be processed into power density. The absorbance analysis and COD level were carried out with a spectrophotometer. The results of this study showed that the concentration of 100% batik wastewater and 2:2 bars graphite electrode was the best results in MMFC process with the highest voltage and the highest current of the run was found to be 0.108 V and 0.039 A. Besides, the addition of yeast to batik wastewater has a major influence on the results of the MMFC process. Because, yeast became a catalyst in oxidizing waste which made electron transfer more frequent.

Keywords
Batik Wastewater, Bioelectricity, Chemical Oxygen Demand, Chlorella vulgaris, Microbial Fuel Cell, Power Density

Topic
Bioenergy

Link: https://ifory.id/abstract/jceRaHGd2hvq

Corresponding Author
Fitriani Apendi

Institutions
(a) Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154
(b) Department of Mathematics Education, Universitas Pendidikan Indonesia, Jalan Dr. Setiabudhi No. 229 Bandung, Jawa Barat, Indonesia 40154
(a) fitriani14[at]upi.edu
(b) sufyani[at]upi.edu

Abstract
The ability of mathematical reflective thinking must be possessed by students in Industry 4.0. This study used descriptive qualitative research that aims to determine the reflective thinking ability of senior high school students on pattern numbers. The research subjects were 10 students of class XI. Based on data analysis, it is found that: generally students could (a) check the validity of arguments based on the concepts used, (b) identify mathematical concepts used in mathematical solutions by reasons, and (c) show the difference between relevant and irrelevant data in solving the problems. Whereas only few students can (a) generalize by reasoning, and (b) solve the problems using various strategies.

Keywords
Mathematical Reflective Thinking, Patterns of Numbers

Topic
Mathematics Education

Link: https://ifory.id/abstract/9qxwT7nFGMb4

Corresponding Author
Gregorius Prima Indra Budianto

Institutions
(1) Chemical Engineering, Engineering Faculty, Setia Budi University, Jalan Let Jend Sutoyo, Mojosongo, Surakarta, Indonesia
*email: gregoriusprima2[at]gmail.com
(2) Analyze Chemistry, Engineering Faculty, Setia Budi University, Jalan Let Jend Sutoyo, Mojosongo, Surakarta, Indonesia
(3) Chemical Engineering, Engineering Faculty, Diponegoro University, Jl. Prof. Soedarto, Tembalang, Semarang, Indonesia

Abstract
Vinasse is ethanol wastewater that still contains nutrient so that it can be medium cultivation for chlorella sp. Cultivation chlorella sp. in vinasse not only for minimize its COD content but potentially to produce PHB in limited nutrient. This paper presents a cultivation process of chlorella sp in vinasse on various limited nutrient. Chlorella sp was cultivated in vinasse by adding complete nutrient (urea and TSP); adding TSP in vinasse (limited N) and adding urea in vinasse (limited P). Experiment data was optimized by mathematical model to compare the difference of limited nutrient systematically. The study confirmed that the best condition of medium of microalgae cultivation to minimize COD content in vinasse by addition phosphate into reactor. However, PHB could be best accumulated in the cell on limited phosphate medium.

Keywords
chlorella sp., nutrient, vinasse, PHB

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/ALrVnCXPuQHy

Corresponding Author
Neena Zakia

Institutions
a) Division of Analytical Chemistry, Institut Teknologi Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia
*neena.zakia.fmipa[at]um.ac.id
b) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang
Jalan Semarang 5, Malang 65145, Indonesia

Abstract
Alpha mangostin is a major component in the mangosteen rind, which has activity as an antioxidant, antitumor, hypo-allergenic, and anticancer. The aim of this study is to synthesize molecularly imprinted polymer (MIP) for alpha mangostin adsorption. The MIP was prepared by bulk polymerization with alpha mangostin as template, methacrylic acid as the monomer, ethylene glycol dimethacrylate as the crosslinker, and benzoyl peroxide as the initiator and acetonitrile as porogenic solvent. A molar ratio of template:monomer:crosslinker is 5:4:20. A non-imprinted polymer was synthesized in the absence of alpha mangostin. Solvent extraction is carried out to remove the template used methanol:acetic acid (90:10, %v/v) as the solvent. The surface morphology of MIP was visualized by scanning electron microscopy (SEM). The synthesized MIP was characterized by infra red spectroscopy. It showed that wavelength number were 2957, 1603, and 1456 cm-1 assigned to characteristic vibration of a C-H bond, a chelated carbonyl group and a methoxy groups, respectively, which indicated the present of template molecule. The adsorption capacity of MIP for alpha mangostin was 12,17 mg/g with the imprinting factor 1,2. Overall, this MIP has a good chance to be used as functional material for alpha mangostin adsorption.

Keywords
alpha mangostin, molecularly imprinted polymer, adsorption

Topic
Chemistry

Link: https://ifory.id/abstract/UdctrnqCDYgE

Corresponding Author
Bambang Retnoaji

Institutions
Faculty of Biology, Universitas Gadjah Mada, Yoyakarta, Indonesia

Abstract
Water pollution by laundry detergents is a big concern, that can cause a variety of water pollution problems. Rasbora lateristriata is one of Indonesian endemic fish, which is very popular among people. Until recently, the reproduction proccesses of the fish occurs ini the rivers. The release of detergent from loundry tot he river is increasing recently. Therefore, this condition is possible leading to disturbtion of fish reproduction. The study was conducted to determine the effect of detergents on eggs hatchability, survival rates, morphometry and bone structure of wader fish. The fish were treated with detergent solution, with concentration of 0, 3, 6, and 9 ppm. Each test consists of 1 aquarium filled with 30 eggs. Eggs were hatched in detergent solution then calculated hatchability and survival rates for 1.5 months. The morphological characters observed were morphometry using ImageJ software. Bone structure preparations were made using specimens fixed with 96% alcohol then stained with the Alizarins Red-Alcian Blue staining method (Inouye, 1976). In each treatment 0, 3, 6, 9 ppm the percentage of egg hatchability was 96.67%; 95.56%; 96.67%; 96.67%. The percentage of survival rates is 90.84%; 88.34%; 83.81%; 87.55%. Morphometry of total body length of 4.45 cm; 4.24 cm; 4.37 cm; 4.33 cm. ANAVA test results on hatchability, survival rates, and morphometry showed no difference in all treatments (P> 0.05). The bone structure of the ray wader vertebrae is 31. The vertebral arch on the treatment is 0, 3, 6 ppm normal, while at 9 ppm there is showing abnormal tendency. It was concluded that ray wader fish can still tolerate detergents up to 9 ppm.

Keywords
Detergent, Hatchability, Morphometry, Bone Structure, R. lateristriata

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/v6JZYFQ2rEnt

Corresponding Author
Siti Inna Zainab

Institutions
a) Departement of Physics Education, Indonesia University of Education Jalan Setiabudhi No.229, Isola, Bandung 40154, Indonesia *sitiinna85[at]gmail.com; mimin_iryanti[at]yahoo.com.
b)Departement of Geology Tanjungpura University Jalan Prof. Hadari Nawawi, Pontianak 78124, Indonesia.

Abstract
The usage of peatland received great attention especially for the cultivation of plantation crops. Soil fertility is determined by the soil texture which had an ideal fraction composition. The texture can also be used as a criterion of land classification and land suitability. Aloe vera was one of the leading commodities in West Kalimantan which well grown in peatland rather than in another type of land. This research aimed to determine the texture characteristic of peat soil on the land of aloe vera in West Kalimantan. The research method used sieve analysis and hydrometer. These measurements were carried out at the TekMIRA Testing Laboratory. The sieve analysis test result can be classified as soil texture in which using the USDA (United States Department of Agriculture) gradation concept. According to the soil texture classification by using USDA, this research obtained the data of sand texture had an average sand portion of 96.54%, silt average of 2.65%, and clay average of 0.81%. The portion of sandy clay texture was 87.57% sand, 8.27% silt, and 4.16% clay. While the texture of clay soil had a proportion of sand 5.10%, silt 36.50%, and clay 58.20%. In sum, the characteristics of the peat soil texture on the aloe vera soil classified in the texture of sand, sandy clay, and clay.

Keywords
Soil texture, Peat Soil, Aloe vera.

Topic
Physics

Link: https://ifory.id/abstract/KC6Dp2LRc3Vm

Corresponding Author
Hertanto Hertanto

Institutions
1 Department of Chemical Engineering, Diponegoro University, Indonesia
2 Center of Biomass and Renewable Energy, Diponegoro University, Indonesia

Abstract
Biodiesel can be produced from various vegetable oils, and animal fat. The abundant sources of vegetable oil in Indonesia such as calophyllum inophyllum, ricinus communis, soybean oil, corn oil, palm oil, and waste cooking oil were used as raw materials. Multi-feedstock biodiesel were used in this study to increase the flexibility operation of biodiesel production. This study was conducted to determine the effect of combination vegetable oils in the characteristic of biodiesel, and to determine the kinetic rate of the variables. Proses of esterification were applied for high free fatty acid feedstock before trans-esterification process which combine with other vegetable oils. Potassium hydroxide was used as homogenous catalyst, and methanol as another raw material. Acid value of calophyllum inophyllum can decrease from 54 mg KOH/gr oil to 2.15 mg KOH/gr oil after two steps of esterification. Biodiesel yield from multi-feedstock was obtained 71.42% with molar ratio methanol to oil 6:1, temperature 60°C, and 1%wt catalyst for 2 hr reaction time.

Keywords
multi-feedstock biodiesel, trans-esterification, calophyllum inophyllum, palm oil, waste cooking oil.

Topic
Bioenergy

Link: https://ifory.id/abstract/hLvgufaWXQC7

Corresponding Author
Muhamad Ariq Al Badar

Institutions
Department of Chemical Engineering, Politeknik Negeri Bandung
Jl. Gegerkalong Hilir, Bandung 40559, Indonesia
*haryadi[at]polban.ac.id

Abstract
The growth of the textile industry in Indonesia brings harm to the environment as disposal of wastewater to the river bodies still contains dangerous dyes. This affects the life of aquatic biota and the health of surrounding communities that use river water for domestic needs. To overcome this problem, N-doped Carbon Nanodots (N-doped CNDs) as photocatalysts can be used as an alternative in degrading Methylene Blue through photocatalytic process. N-doped CNDs from molasses have been successfully synthesized using H2O2 followed by the Microwave-Assisted Extraction (MAE) method. The synthesized N-doped CNDs possess average particle size of 1.5 nm observed by TEM. The properties of N-doped CNDs emit blue fluorescence under UV light 365 nm and show peak absorption at wavelength of 220 nm. Vibration peaks of OH, C-H, C = O, N-H, C-N functional groups are observed by FTIR at wavenumbers 3246.94 cm-1, 2929.06 cm-1, 1656.08 cm-1, 1590.27 cm-1 and 1036.98 cm-1 respectively. The success of nitrogen doping within CNDs is proven by FTIR analysis showing an increase of absorbance of C-N and N-H groups of N-doped CNDs. The potential of N-doped CNDs as photocatalysts for the degradation of methylene blue became the object of this study. The results showed that the degradation efficiency of methylene blue using 3 mL N-doped CNDs at pH 10 exhibited the most optimal degradation efficiency. Under these conditions, the degradation efficiency resulting from the use of 254 nm 11 W UV lamps and 14.5 W Philips LED lamps in 270 minutes is 96.8% and 97.2% consecutively.

Keywords
Methylene Blue; N-doped Carbon Nanodots; Molasses; Photocatalysts

Topic
Chemistry

Link: https://ifory.id/abstract/mBHgVzUx3nJ7

Corresponding Author
Tri Rini Nuringtyas

Institutions
1 Faculty of Biology, Universitas Gadjah Mada, Yogyakarta, Indonesia
2 Faculty of Agriculture, Universitas Gadjah Mada, Yogyakarta, Indonesia
3 Research Center for Biotechnology, Universitas Gadjah Mada, Yogyakarta

Abstract
Black rice is usually consumed as a functional food owing to its high anthocyanin content, which functions as an antioxidant. However, bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) has resulted in reduction in yield. Black rice has been reported to have a higher resistance to BLB than other local black rice cultivars. Here, we aimed to determine the metabolite responses of several black rice cultivars following Xoo infection. Two local black rice cultivars, Melik and Pari Ireng, and two white rice cultivars, IR64 and Java14, were treated with Xoo pathotype IV and a mock negative control (physical damage). GC-MS was used for the metabolite profiling analysis, followed by the quantification of total phenolic concentration (TPC) and total flavonoid concentration (TFC). Across all cultivars, the results revealed that following Xoo infection, there were significantly higher concentrations of primary metabolites including sugars, sugar alcohols, fatty acids, glycerol, and some organic acids. In Pari Ireng and Melik, sugars including fructose, mannose, and gluco-hexodialdose were present in a significantly higher concentration following the infection than before it. The infection significantly increased the TPC as follows: Java14 (0.841 % ± 0.005 %), followed by Pari Ireng (0.809 % ± 0.005%), Melik (0.771 % ± 0.003%), and IR64 (0.514 % ± 0.006%). Regarding TFC, the incerease following the infection was greater for Pari Ireng (0.517 ± 0.005 μm/g) than for Melik (0.465 ± 0.001 μm/g).

Keywords
Bacterial leaf blight, pigmented rice, GC-MS, metabolomics, Xoo infection

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/Ezf4xKrvGXZ3

Corresponding Author
Isnie Yusnitha

Institutions
Department of Mathematics Education, Universitas Pendidikan Indonesia

Abstract
Suppose G is a cyclically ordered group. In general, a positive cone P(G) is not necessarily a semigroup. Nevertheless, for particular class of cyclically ordered group G, namely linear cyclically ordered group, P(G) is a semigroup. Furthermore, one can verify that the semigroup P(G) admits a representation on a Hilbert space. We develop the classical Toeplitz algebra theory to more general setting of ordered group, that is, to each cyclically ordered group G such that the positive cone P(G) is a semigroup, we define a Toeplitz algebra Τ (G).

Keywords
cyclically ordered group, linear, semigroup, Toeplitz algebras

Topic
Mathematics

Link: https://ifory.id/abstract/4px7qR9NZLQg

Corresponding Author
Ade Astri Muliasari

Institutions
College of Vocational Studies, Bogor Agricultural University

Abstract
The availability of technologies such as pruning and plant growth regulators are important, because it may increase crop yield. Pruning coffee plants is intended to stimulate generative growth that increases productivity to reach optimal and continuous production all year. PGR makes it possible to exploit the production potential of plants. Pruning management combined with the PGR in coffee plants is expected to improve flowering and berry growth. The research was conducted for 7 months since October 2017-April 2018 at Gunung Gede. A split-plot design with 2 treatment factors, pruning was placed as the main plot consisting of 2 levels, namely without (P0) and with pruning (P1). The PGR application was placed as a subplot, consisting of 3 doses, namely without PGR (Z0), and concentrations of 0.3 ml/l (Z1) and 0.4 ml/l (Z2). The results showed, the pruning treatment significantly influenced microclimate, number of branches, B0, B1 and B2, number of berry sets, and berries. Pruning treatment has a very significant effect on microclimate, plant height, number of branches, number of coffee fruits, yields/crops, and productivity. Interaction between pruning and PGR significantly affected plant height and B0. The best dosage for PGR treatment has not yet been found.

Keywords
Arabica coffee, branches, pruning, PGR, yield

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/qwfkCPuXmKvD

Corresponding Author
fit Yanuar

Institutions
Universitas Sahid

Abstract
Sexual desease is a health and social problem that need solution. One of the solution is a dareness of sexual worker to be brave to talk in the relevant forum to share the fact and problem, since they know how to manage the sexual desease in their own way. But they are afraid to talk in front of public. The coaching of public speaking may become a solution. The result is quiet good. There were an increasing member of the group that then be brave to talk in public forum. The coach is given to the member of social organization named OPSI Jakarta.

Keywords
sexual desease, public speaking training, sexual worker, OPSI Jakarta

Topic
Communication Environment

Link: https://ifory.id/abstract/LEXYFkZPr4ez

Corresponding Author
Didi Suhaedi

Institutions
Program Studi Matematika, Universitas Islam Bandung

Abstract
Algebra thinking is one of the abilities students must have in learning school algebra. The weak algebraic thinking ability of junior high school students is one part of the problems in mathematics education. One effort to solve these problems is to innovate learning with a realistic mathematics education approach. This study is a quasi-experiment about improving students algebraic thinking abilities, with the experimental class using the realistic mathematics education approach and the control class using conventional learning. The research sample consisted of 134 eighth grade students of junior high schools in Bandung. The results of the study show that increasing the algebraic thinking ability of students who get learning with a realistic mathematics education approach is better than students who get conventional learning at every level of students initial mathematical knowledge.

Keywords
school algebra, algebraic thinking, realistic mathematics education

Topic
Mathematics Education

Link: https://ifory.id/abstract/7kcK3j2BGzTe

Corresponding Author
LUTFY LUTFY DITYA CAJYANTI

Institutions
Darussalam Gontor University

Abstract
Abstract. The experiment aims to knowing the effect off row circle planting method on growth of sweet corn. This research was conducted in the Sub District of Siman District of Siman, Ponorogo, with altitude 140 amsl and textured clay grumosol soil types. The research used a randomized block design (CBD) with 4 kinds of planting spaces included C1 = 8 plant / (60x80) cm2, C2 = 16 plant / (60x80) cm2, C3 = 12 plant/ (60 x 80) cm2, C4 = 1 plant/ (60 x 80) cm2, C5 = 1 plant/ (60 x 80) cm2 with mowing. Each experimental unit was repeated 5 times so that there were 25 units. The observation was done at on 21,28, 35, 42 and DAP (day after planting). Some vegetative growth traits of sweet corn were determined as: plant height (cm), no. of leaves (leaf plant-1), leaf area (m2). Data obtained from observations were analyzed using analysis of variance (ANOVA) with a confidence level of 95%. The result showed not significantly different between row circle planting method on height of plant, number of leaf, leaf area, and leaf area index. However, it was clearly seen on the graphic that in treatment with C1 = 8 plant / (60x80) cm2 on 49 dap had the tallest height with a value of 194.60 cm. On the other hand, was observed in treatment 1 plant/ (60 x 80) cm2 with a value of 184.40 cm.

Keywords
sweet corn, plant, growt, row, method

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/XRGzm2yPUb4Q

Corresponding Author
Kania Ratnasari

Institutions
Universitas Sahid

Abstract
Milk drinks made through bacterial fermentation or commonly called yogurt are increasingly popular in Indonesia. The benefits for health are quite a lot, especially for digestion and skin health. Therefore, lovers of this acidic drink has not faded. One of the business actors who take advantage of this opportunity is Utari Dayanuri or commonly called Tarie. She opened the Yogurt House since 2007 in her own home in the Tebet area. There are several problems in developing partner products, namely in terms of product design and labeling, marketing and product legality permits. The PKM activities carried out are related to the problems of the partners above by making efforts to empower and develop partnerships to be able to develop business partners by increasing entrepreneurial managerial knowledge and marketing insights. The result of this PKM activity is that the partner is currently doing house renovation, especially kitchen renovation as one of the requirements to get BPOM legality permit, then the partner has now been audited to get the halal logo of the MUI, the partner is also one of the fostered agencies of the DKI Provincial Government Office Cooperatives and the Department of Industry so as to open up opportunities for partners to get a variety of free bazaars also take part in marketing training for the sustainability of the partners home business, Rumah Yogurt.

Keywords
Entrepreneurship, Entrepreneurs, Rumah Yogurt, Business Development, Culinary

Topic
Entrepreneurship and Innovation

Link: https://ifory.id/abstract/t83ZGNxXcaKY

Corresponding Author
Annisa Nadhira

Institutions
a) Department of Physics Education, Indonesia University of Education Jalan Setiabudi No. 229
Bandung 40154, West Java, Indonesia
*its.annisanadhira[at]gmail.com
b) Physics of Complex Systems, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10
Bandung 40132, West Java, Indonesia

Abstract
Knowledge about the physical parameters of rocks is important in order to understand the properties associated with the fact that porous rocks are fluid storage media. The amount of the contained fluid can be estimated roughly by analyzing the pore fraction of rocks. To investigate the pore evolution, a series of uniaxial compression test was conducted on an altered breccia rock sample. The sample was obtained from a potential geothermal area at Kadidia-Sigi, Sulawesi Tengah. The uniaxial compression treatment started from the natural pressure 438,468 N/m2 then, 629,079 N/m2, 1,887,238 N/m2, 3,145,396 N/m2, 4,403,554 N/m2, and 5,032,633 N/m2. Digital image processing and analysis method were applied to record and analyze the deformation of pore and fracture structure. Qualitative analysis was conducted by investigating the produced 2D and 3D images, and it was shown that the pore intensity and the fractures intensity increases as the pressure increase. Quantitative analysis was conducted by investigating the porosity and specific surface area as a function of the applied pressure. It was found that porosity {ϕ(P)} is in the function of a positively second-degree polynomial and specific surface area {SA(P)} is in the function of a negative second-degree polynomial.

Keywords
pore structure; uniaxial mechanical pressure; an altered breccia rock

Topic
Physics

Link: https://ifory.id/abstract/BxRYNvLh9j6b

Corresponding Author
Yuli Andriani

Institutions
Faculty of Fisheries and Marine Science
Universitas Padjadjaran

Abstract
Color is one of the indicators of quality in ornamental fish. This study aims to test the carotenoid content in butterfly pea leaves as a source of natural pigment and its effect on the tail color quality of green swordfish. Research was carried out using a Completely Randomized Design (CRD) consisting of 4 treatments and 3 replications. The four treatments were carried out by adding 0, 1, 6 and 12% of butterfly pea leaf flour in the feed. The parameters observed in this study were including carotenoid content of dried butterfly pea leaves, changes in color quality of the green swordfish tail, survival, and water quality. The color observations data were analyzed using the Kruskal-Wallis analysis, if there were differences between treatments, a multiple comparison was performed using the Z test with a 95% confidence level. Survival data were analyzed using analysis of variance using the F test with a 95% confidence level, if there were differences between treatments, the test then followed by the Duncan test with a 95% confidence level. The results showed that there were 9067 mg / kg of carotenoid contained in dried butterfly pea leaves. The addition of 12% butterfly pea leaf flour to commercial feed was able to improve the color quality on the tail of the green swordfish with an average color score of 5 and a color value of 87.3. Addition of carotenoids in feed does not significantly affect survival, and water quality. These results indicated that the use of butterfly pea leaves is safe to use as a source of natural pigment for ornamental fishes, such as swordfish.

Keywords
swordfish, carotenoids, color quality, feed, butterfly pea leaf meal

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/hJMrBQw9ZAng

Corresponding Author
Singmin Johanes Lo

Institutions
UNIVERSITAS MERCU BUANA

Abstract
This paper is about empowering the economy for community development through hydroponics cultivation. Pre-activity data on partner community were collected by on site interviews and field observation. From data analysis, it was suggested to do hydroponics farming for partner community. Training on hydroponics and how to grow plants hydroponically was given. The knowledge and skills about food crops produced by hydroponics cultivation were given through training. It was done by giving interactive lecture and on site practice on November 11, 2018 to fifteen participants, mostly homemakers, from Desa Anggadita, East Karawang, West Java as partner community. All participants were involved in group discussion, and were very happy for the training. They got the knowledge on hydroponics. They knew the many economic and social benefits in doing hydroponics farming. Having the knowledge and skills needed for hydroponics farming and couple with partner community enthusiasms, they were challenged to do hydroponics farming on their front or backyards. The partner community can soon provide healthy food, herbs medicine, and flowers products for their own use and for commercial purposes, eventually. Partner community awareness on hydroponics farming will also contribute to healthy community lifestyle, greener environment, and community sustainable development.

Keywords
hydroponics, community, training, economic, healthy, green, sustainable development

Topic
Sustainable Development

Link: https://ifory.id/abstract/pfu2JLZ8jFYV

Corresponding Author
Pradipta Swiantana Prayoga

Institutions
Universitas Pendidikan Indonesia

Abstract
Introduced by Z. W. Birnbaum and W. Orlicz in 1931, Orlicz spaces are generalization of the Lebesgue spaces. There are two kinds version of Orlicz spaces which are continuous Orlicz spaces denoted by (L_Φ) and discrete Orlicz spaces denoted by (l_Φ). The properties of (L_Φ) spaces are already known. The aim of this study is to discuss the properties of discrete Orlicz spaces. We will see that the properties of continuous Orlicz spaces are also valid on discrete Orlicz spaces. Methods in this research are by using the properties of Young function and Luxemburg Norm. The result of this research is to show that several properties of continuous Orlicz space are also valid on discrete Orlicz space.

Keywords
Lebesque spaces, continue Orlicz spaces, discrete Orlicz spaces

Topic
Mathematics

Link: https://ifory.id/abstract/prZVE2Hb7XLD

Corresponding Author
Tri Rini Nuringtyas

Institutions
1 Faculty of Biology, Universitas Gadjah Mada Yogyakarta, Indonesia

Abstract
Banana is one of the most consumed food commodities in the world. People consume fruit flesh and remove peel as wastes. Banana peels contain starch, pectin, and phytochemical compounds such as phenolic and flavonoids that act as natural antioxidants. This study aimed to determine the antioxidant activity of Kepok Kuning banana peel extract (Musa paradisiaca L.) and Cavendish (Musa acuminata Colla, AAA), and its potential as a preservative of chicken meat. The dried banana peel was extracted using 80 % methanol. Kepok crude extract (KCE), cavendish crude extract (CCE) were evaluated for their antioxidant activity using DPPH and FRAP methods. BHT was used as a synthetic preservative control. Both extract KCE, CCE, and control BHT were tested for their preservatives potency for chicken meat. Three controls were meat without treatment, meat  2% salt and positive control meat  BHT 0.1%  2% salt. Whereas the treatments included meat + EKK + salt 2% and meat + EKC + salt 2%, both at concentrations of 5%, 10%, and 15%, respectively. The parameters observed were changes in the color of the meat for eight days incubation in the refrigerator. It was observed with ImageJ software while free fatty acid (FFA) contents were determined by titration. The results showed that both EKK 15% and EKC 15% showed higher antioxidant activity than 0.1% BHT. There was no significant difference between treatments on the L (lightness) and b (yellowness) values, but not for a (redness). FFA values were significantly different between treatments with the highest value in the untreated control at 0.41% and the lowest at 0.12% for the EKK 15 % and EKC 15%. These results indicate that both banana peel extracts have the potential to be developed as preservatives of chicken meat.

Keywords
banana peel, natural preservatives, antioxidant, fenolic, flavonoids

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/CzQJZMLDu9jm

Corresponding Author
Tugiyo Aminoto

Institutions
Physics Education Department of Jambi University
*) tugiyo[at]unja.ac.id

Abstract
Teaching and learning which mainly based on conventional media, offers limited resources in exploring a comprehensive concept of statistical physics phenomena. As a consequence, it needs to incorporate a computer simulation whose has superiority in visualizing a wide range of complicated and abstract physics concepts. This study aims to develop a computer simulation of gas speed measurement as a learning medium on the subject of Maxwell distribution. Measurement of very small and un-naked eye gas particles requires special techniques and tools that involve a complicated process of selecting particles and measuring their speed. For learning purposes, this measurement process needs to be done with computer simulation. This research uses the ADDIE model which includes analysis, design, development, implementation and evaluation. The results of the simulation show conformity with Maxwell-s speed distribution graph which was obtained theoretically and can enhance the quality of teaching of this subject.

Keywords
learning media, computer simulation, gas velocity measurement

Topic
Physics Education

Link: https://ifory.id/abstract/gQFDrEu76KVA

Corresponding Author
Miftahul Ajri

Institutions
Plant Pest Science Study Program, Faculty of Agriculture, Universitas Gadjah Mada

Abstract
Ditylenchus dipsaci (stem and bulb nematode) can attack garlic and cause distortion and yellowing of leaves and necrosis or rotting of bulbs. The existence of D. dipsaci was first reported in Temanggung, Central Java in 2018. This study aims to determine the distribution area of Ditylenchus spp. on garlic crops in Central and East Java. Samples of garlic crops were taken by purposive sampling method. Nematodes were extracted from bulbs and roots by water immersion method. Ditylenchus sp. found in the center of garlic crops in Magelang, Temanggung, Karanganyar, Tegal and Brebes (Central Java) and Mojokerto and Malang (East Java). The highest population of Ditylenchus sp. was found in Kaliangkrik, Magelang, Central Java (52,53 nematodes/5 gr bulbs) and Poncokusumo, Malang, East Java (45,73 nematodes/5 gr bulbs). The infested varieties of garlic were Lumbu Kuning, Lumbu Hijau, Tawangmangu Baru dan Sangga Sembalun. Lumbu Kuning was the variety with the highest nematode population (24,30 nematodes/5 gr bulbs). Ditylenchus sp. was not found in Tawangmangu Baru and Lumbu Kuning varieties in Karanganyar, but was found in the same variety in Magelang and Tegal. Based on the specific symptoms, morphological and morphometric characters, the nematode species found that infects garlic is Ditylenchus dipsaci.

Keywords
distribution, Ditylenchus spp., Garlic

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/tLB38edUj79W

Corresponding Author
Yaya Wihardi

Institutions
Universitas Pendidikan Indonesia

Abstract
Facial expression recognition is the process of identifying the expression that is displayed by a person. It can be used to evaluate the mood of students during a class so that can help teachers improve the learning goal achievement. However, the recognition process in real environments such as in classrooms is still a challenging problem due to different expressions and illumination under arbitrary poses. In this paper we present a convolutional neural network based method that combining with gray level coocurence matrix. The result show that the proposed method can recognize three category of student facial expressions that represent good, bad, and neutral mood.

Keywords
Facial Expression, CNN, GLCM, Mood Detection

Topic
Computer Science

Link: https://ifory.id/abstract/EqhYnZgAVG29

Corresponding Author
Indra Lesmana Rahayu

Institutions
1Department of Biotechnology, Postgraduate School, Gadjah Mada University, INDONESIA, 2Department of Reproduction and Obstetrics, Faculty of Veterinary Medicine, Gadjah Mada University, INDONESIA
3Department of Pharmaceutics, Faculty of Pharmacy, Gadjah Mada University, INDONESIA

Abstract
Background: Jembrana disease (JD) caused by Jembrana Disease Virus (JDV) becomes an obstacle in Bali cattle (Bos javanicus) which is local Indonesian cattle. The development of JD vaccines has an important meaning to prevent losses the Bali cattle industry in Indonesia and is one of the models in the development of the Human Immunodeficiency Virus (HIV) vaccine. Development of vaccines for JDV is carried out DNA vaccines that are expected to be able to provide better immunological effects. But, the challenge in DNA vaccines is in the delivery system of target genes to cells, so to solve this problem, research is carried out on the use of chitosan as a protective molecule as well as carrying the target gene to cells. This research was conducted at the Genetic Engineering Laboratory, Postgraduate School, Gadjah Mada University in September 2018-March 2019 Aims: The purpose of this study was to determine the low molecular weight chitosan (LC) entrapment towards pEGFP-C1-env-Tm in the formation of Chitosan Nanoparticles Low/pEGFP-C1-env-Tm complex (LC/pEGFP-C1-env-Tm). Materials and Methods: The env-Tm gene is inserted in pEGFP-C1 into the pEGFP-C1/env-Tm construct which is then transformed on the E. coli DH5α host. The construct is then formulated in the form of LC/pEGFP-C1/env-Tm complex with a low molecular weight chitosan concentration of 0.06% and the ratio of pEGFP-C1/env-Tm:LC (wt/wt) is 1:0.5-1:3. The complexes are then analyzed by gel retardation assay agarose 1%. Results: The results of this study indicate that the best entrapment results of low molecular weight chitosan to pEGFP-C1/env-Tm is in the mass ratio of pEGFP-C1/env-Tm:LC is 1:2. Conclusion: The best formulation entrapment for env-Tm by low molecular weight chitosan 0.06% is in the ratio 1:2.

Keywords
env-Tm gene, Jembrana Disease Virus, Low Molecular Weight Chitosan.

Topic
Environmentally Sustainable Agriculture

Link: https://ifory.id/abstract/JrTGNw82uHfR

Corresponding Author
Erna Piantari

Institutions
Departemen Pendidikan Ilmu Komputer, Universitas Pendidikan Indonesia - Indonesia
Teknik Informatika, Universitas Jenderal Achmad Yani - Indonesia
University of the Cumberlands, Kentucy - USA

Abstract
Nowadays the development of information technology has driven the development of e-commerce which is quite promising in Indonesia. This development has brought an era of new digital-based creative developments. Agriculture as one of the economic and community welfare bases in Indonesia needs to be developed and supported with information technology. One of the technologies commonly used in sales and marketing is the marketplace. This study aims to create a marketplace architecture model that is in accordance with the characteristics of business actors in agribusiness. The marketplace architecture is built based on the architecture of the Next Generation E-Commerce Platform and Agriculture Supply Chain Management.

Keywords
marketplace, agribusiness e-commerce, e-commerce, Agriculture SCM

Topic
Computer Science

Link: https://ifory.id/abstract/7MeKNnTFq2yt