Indonesia Conference Directory

Corresponding Author
Doni Anshar Nuari

Institutions
a) Departement of Pharmacy, Faculty of Mathematics and Natural Sciences Universitas Garut, Garut, Indonesia
*doni[at]uniga.ac.id
b) School of Pharmacy, Institut Teknolonogi Bandung, Bandung40132

Abstract
Stressful is the root from many problems sociological, medical, and economy. Stressful known is factor etiology from any diseases. Prostaglandin and fourth receptor big once the effect to the brain, and even influence behavior so that inactivation cyclooxygenase (COX) which causes decline prostaglandin levels to contribute on the development of stress, so suspected will give away decline effect work anxiolytic from Diazepam. Research when this test influence the administration of selective COX inhibitors and nonselective to effect Anxiolytic diazepam uses method EPM (Elevated Plus Maze) on mice white male. Group of animal Tragakan 2% , Diazepam 0.65 mg / kg BB, Diazepam 0.65 mg / kg BB one hours later Ketoprofen 6.5 mg / kg BB, Diazepam 0.65 mg / kg BW an hour later Selekoksib 6.5 mg / kg BB . Results showing happen decline duration on open arm group has given diazepam combination ketoprofen or celecoxib are different P value <0.05 than diazepam only. Decline duration highest showed by animals given celecoxib so that could be stated gift selective COX-2 inhibitors bring down effect anxiolytic diazepam bigger.

Keywords
Anxiolytic, Cox Inhibitors, Diazepam, Elevated Plus Maze, Ketoprofen, Celecoxib

Topic
Pharmacology

Link: https://ifory.id/abstract/7HG6exgzdCXq

Corresponding Author
Reno Pratiwi

Institutions
Petroleum Engineering, Trisakti University, Jl Kyai Tapa no. 1, Jakarta Barat, Indonesia
* reno.pratiwi[at]trisakti.ac.id

Abstract
Contiuous increasing of fuel need in Indonesia, at least in the last ten years, is the reason for improving domestically crude oil production. Exploitation in the form of oil drainage activities needs to be investigated further. Surfactants as an agents that believed can reduce interfacial tension, need to be determined the formulation and compatibility in their use for oil drainage from reservoirs. Screening of the conditions of surfactant operation needs to be done in order to provide optimal oil recovery. In this study a surfactant behavior test was carried out on AOS (Alpha Olephin Sulfonate) in a laboratory scale, using sandpack as a sandstone reservoir rock prototype, measured the effect of salinity and concentration on oil recovery in chemical flooding. From the measurements, it was found that a surfactant concentration of 1.5% worked optimally in formation water with a salinity of 10,000 ppm, and produced a recovery factor of 7.5%. The emulsion formed shows that the surfactant works in the upper phase, or tends to dissolve in oil, correlates with the basic ingredients of surfactant which is an oil base.

Keywords
Surfactant, EOR, Oil Recovery

Topic
Chemical Engineering

Link: https://ifory.id/abstract/ucB48e2qahrp

Corresponding Author
Yonik Meilawati Yustiani

Institutions
Department of Environmental Engineering, Universitas Pasundan
Jl. Dr. Setiabudhi 193 Bandung 40153, Indonesia
(*) e-mail: yonik[at]unpas.ac.id

Abstract
Environmental damage that has occurred in Indonesia has severely disrupted public health. Many efforts have been made to improve the environment, both technically and non-technically. But these efforts did not show significant positive results. This condition shows that there needs to be a breakthrough in the form of innovations, especially in terms of technology to prevent and control of environmental damage. This study aims to investigate the potential for innovation in the field of environment that was generated by Indonesias young generation. In addition, this research also portrays the innovation ideas that want to be realized as well as obstacles in realizing them. The method used in this study was the distribution of questionnaires to 78 respondents randomly and a review of secondary data. The results of the study show that innovations to improve environmental conditions are not solely by making pollution control devices, but also innovations related to the use of environmentally friendly energy, organic food, waste recycling, saving natural resources, and innovations that can change the behavior of people as polluter. The results of the questionnaire dissemination also showed that only 50% of respondents felt the support of the Indonesian Government towards innovation development programs. The biggest obstacle for respondents in realizing innovation is limitation in funding and ability to start invention management. Therefore, the most needed activity is training on how to develop ideas into innovations and potential funding that can realize these innovations. The young generation of Indonesia represented by the respondents in this study stated that copyright to an innovation outcome is valuable. As many as 76% of respondents interested in applying license for their innovations in the form of patents or copyrights.

Keywords
Environmental Concervation; Innovation; Young Generation

Topic
Environmental Engineering

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

Corresponding Author
solihin solihin

Institutions
Department of Out-of-School Education, Faculty of Education, Jakarta State University
Biology Education – Faculty of Mathematics and Natural Sciences – Jakarta Islamic State University* solihinone[at]yahoo.com
Indonesian education university. Dr. Styabudi 229 Bandung
Asmis business and multimedia institute

Abstract
Students critical thinking skills in environmental concepts can be improved by one of them by realizing learning through critical literacy training based on mass media. The research was conducted in two places, first at the Didactic LPM Secretariat, UNJ as a routine meeting place and the second at the NGO Unlimited Schools office on Jalan Kemandoran. The purpose of this study was to obtain empirical information regarding the improvement of critical learning skills of members of critical pedagogy groups. The methodology used in this study is Practical Action Research or action research by organizing a learning action in a training model. The results of the research obtained showed an increase in critical learning skills of members of critical pedagogy groups after being given treatment that had been tested by hypothesis with the t-test. The average increase in their critical learning abilities reaches 43%. The conclusion that can be drawn is that this study tends to be able to be a solution to the problems of critical learning that are used functionally in other objects.

Keywords
Critical Learning Environment, Students, Training Model

Topic
Biology

Link: https://ifory.id/abstract/fuW7JAPwxzXd

Corresponding Author
Nizar Alam Hamdani

Institutions
Universitas Garut

Abstract
The increasing human need for natural resources causes global warming. Innovative green technology is one of the eco-friendly actions that can be taken by small and medium sized enterprises (SMEs). The purpose of this study is to discover how SMEs can possibly use green technology. To this end, an explanatory survey was conducted on a sample of 286 batik business units. The results reveal that there are several innovative green technologies that can be used by SMEs. The findings of this study may imply that innovative green technologies can be used to improve SMEs environmental performance.

Keywords
Innovative Green Technology, Green Technology, SMEs.

Topic
Management Science

Link: https://ifory.id/abstract/knUH2qhfFYjQ

Corresponding Author
Niken Subekti

Institutions
a) Biology Department, FMIPA, Universitas Negeri Semarang Jalan Taman Siswa, Semarang 50229, Indonesia
*nikensubektiunnes[at]gmail.com
b) Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia,
81310 UTM Skudai, Johor, Malaysia

Abstract
Callosobruchus maculatus (F.) is a stored pest that cause demage to nuts. One of the techniques of preservation of foodstuffs from the insects pest that already done is by using chemical pesticides and fumigant. The use of chemicals continuously can affect to peoples health and pollute the environment and non-target organisms. Pest control using essential oils is considered safer and environmentally friendly. Essential oils used in this study are A. nardus, E. globulus, and M. piperita. It made nanoemultion to reduce evaporation. This research aims to analyze the insecticidal activity of chlorpyrifos and the three types of essential oils as well as their repellent to adult Callosobruchus maculatus (F.). The research method consists of sample preparation, manufacture nanoemultion of essential oils, mortality test, and repellent test. The results showed that the pesticide chlorpyrifos has high insecticidal percentage compared with essential oils, but its use is not environmentally friendly. However, all the encapsulated essential oils in this study has potential to be used as a environmentally friendly pesticides to control the insect pest Callosobruchus maculatus (F.).

Keywords
Callosobruchus maculatus (F.), chlorpyrifos, essential oil

Topic
Biology

Link: https://ifory.id/abstract/A97uBKNGjRJw

Corresponding Author
Dodit Suprianto Suprianto

Institutions
(a) Information Engineering, Politeknik Negeri Malang
(b) Electrical Engineering, Politeknik Negeri Malang,
(c) Science & Technology, Universitas Kanjuruhan Malang

Abstract
Long queues during student pick-up are a major problem in some elementary schools and kindergartens. Sometimess parents dont find their children in school because they may be buying food, being in class or playing in a large school area, so their parents have to wait for a long time for their children to go out to the gate. Conversely, sometimes parents are late in picking up their children, which causes the school to keep students from leaving school without the permission of the teacher or officer, and they also have to ensure that all students have returned to their homes. Parents complaints about this pick-up problem are a serious concern for the school. Moreover, the news of the kidnapping of children aged 4-12 years (the crime of trafficking) will worry all parties. This study aims to design integrated applications by utilizing RFID, Microcontroller, Socket TCP, Text To Speech, Client Server and Database as a student pickup model by parents as registered RFID cardholders. Based on the identification of the parent RFID card that is read by the RFID reader sensor and matched with the data in the database, then the application will automatically call the name of the student according to his RFID through the technique of text to the speech voice synthesizer. The method of developing applications using Waterfall. The results of implementing this application system show that the performance accuracy of 90% can be used properly.

Keywords
RFID, Mircrocontroller, Arduino, Socket TCP, Text To Speech, Voice Synthesizer, Client Server Database

Topic
Computer and Communication Engineering

Link: https://ifory.id/abstract/xNRjy9P7Anwd

Corresponding Author
Riyan Arthur

Institutions
a) Faculty of Engineering, State University of Jakarta
Jl. Rawamangun Muka No.1 Jakarta Timur 13220
arthur[at]unj.ac.id

b) Faculty of Engineering, State University of Jakarta
Jl. Rawamangun Muka No.1 Jakarta Timur 13220
daryati_sr[at]unj.ac.id

Abstract
The Construction Vocational Education System in Indonesia was initiated based on competency and work-related experience. The problem of competency measurement is not the assessment but the relevance of the world of work. Therefore, it is very important to develop a focus on performance and alignment with work. In this paper, a construction worker instrument is developed that measures competency in building construction vocational education. Measurements and assessments further highlight procedures and results that are integrated with the work applied

Keywords
instrument; construction; building; workers

Topic
Civil Engineering

Link: https://ifory.id/abstract/Tn7bHtrMGgkf

Corresponding Author
Yuri Ariyanto

Institutions
State Polytechnic Of Malang

Abstract
With the advancement of computer virtualization technology, the use of cloud computing technology began to be scrutinized by researchers. With the existence of cloud computing technology can make computer virtualization on a server that is running. This can save the cost of providing information technology and operational infrastructure independently for each service that will be served. With this technology one physical machine is made into a shared resource that can be shared and used by several services at once. In this study made 4 servers using SLIMS7, digital libraries are virtual machines implemented in cloud computing servers with proxmox servers. Database server digital library integration uses Service Oriented Architecture (SOA), by connecting to 4 virtual machine servers. Integration is carried out on the book data search system by entering keywords as book data searches that exist in each digital library server, with the results of displaying all book data on each digital library server according to the keywords. The conclusions of this study obtained after testing the system include the acquisition of a new model in the use of Service Oriented Architecture (SOA) to integrate the search for data books that exist in 4 digital library servers.

Keywords
Database Integration, SOA, Digital Library, Proxmox. SLIMS7

Topic
Computer and Communication Engineering

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

Corresponding Author
ni putu diah witari

Institutions
a) Faculty of Medicine and Health Sciences, University of Warmadewa, Denpasar, Bali
*diahwitari[at]gmail.com
b) Tabanan General Hospital, Bali

Abstract
Indonesia as one of the tropical countries has a high prevalence of dengue. Pathophysiology of dengue fever is through the role of the immune system, one of which is the role of cytokines. Interleukin 8 (IL8) is one of the pro-inflammatory cytokines produced by macrophage cells in the immune response. Several studies have linked interleukin 8 levels with dengue infection. The purpose of this study was to determine interleukin 8 levels in patients with dengue fever. The research design used was a cross-sectional study. Serum samples of 50 samples were collected and then examined for interleukin 8 levels using the ELISA method. The results of this study, more research subjects diagnosed with dengue fever as much as 90% (45 samples) and 10% (5 samples) dengue hemorrhagic fever. Through the Mann-Whitney test analysis, IL8 levels are expressed in the median (minimum-maximum). Levels of IL8 in dengue fever 19.76 (13,70-89,62) and 25,15 (15,74-25,87) in dengue hemorrhagic fever. The conclusion is that interleukin 8 levels were not statistically different between patients with dengue fever and dengue hemorrhagic fever.

Keywords
Interleukin 8, dengue fever, dengue hemorrhagic fever.

Topic
Biology

Link: https://ifory.id/abstract/CjHYU7b94zGh

Corresponding Author
Handrea Bernando Tambunan

Institutions
PLN Research Institute
Transmission and Distribution Department
Jakarta, Indonesia

Abstract
Indonesia has a great solar energy potential because its location in tropical area. One of significant characteristic of solar energy is intermittency. Integration of interimittent renewable energy source (IRES) especially solar energy into electrical power grid can cause significant impact in power system stability. This study aim to model the IRES characteristic, profile, and time duration classification based on collected data in Cipayung microgrid system. The result shows the characteristic of IRES consist in two type, suddenly increase and suddenly decrease of solar source. These two characteristic profile modeled by polynomial and logarithmic regression analysis using mathematically equation. There has not been found a condition where the availability of solar energy value is immediately decrease to high level or increase to zero. The very fast IRES classification of time duration is the most often occurs about 0.5 to 1.0 minutes. System operator can use these model to prepare the power plant and prevent the system collapse even blackout.

Keywords
Intermittent; renewable energy source; regression; solar irradiance; PLN; Microgrid; Cipayung

Topic
Electrical Engineering

Link: https://ifory.id/abstract/H69upNAtMDkP

Corresponding Author
Setia Muljanto Sumantri

Institutions
English Department, Institut Pendidikan Indonesia
Information Technology, Institut Pendidikan Indonesia
Institut Pendidikan Indonesia

Abstract
In the times of digital era, students of higher education are still uncertain about their future plan. With the rapid flow current of technology advancement, students of Indonesia Institute of Education (IPI) are hesitating on deciding to become one profesional teacher or to do a business. Those are the choices that have to be made. Therefore, besides teaching skills, the duty of IPI is also to make an introductory course for their students on entrepreneurial skills. The purpose of this research is to identify students interest in start up business through the introduction of internet and web awareness. Data were gathered by using online and distributed to 117 students in the form of questionnaire and open ended questions.The result of this research showed that by introducing internet and web functions for the business, the students have profound interest to make their own business. The impact of this study was to suggest the government to create a policy for supporting these new emerging start up and the head of higher education to include internet and web literacy into their curriculum.

Keywords
Internet literacy, web literacy, start up business

Topic
Management Science

Link: https://ifory.id/abstract/aLn3Kx9N6ceQ

Corresponding Author
Rena Denya Agustina

Institutions
a) Department of Physics, UIN Sunan Gunung Djati, Bandung
b) Department of Physics Education, UIN Sunan Gunung Djati, Bandung
*renadenya[at]uinsgd.ac.id
c) Department of Mathematicss Education, UIN Sunan Gunung Djati, Bandung

Abstract
Research in the tourism area at Batu Kuda Bandung has been carried out using Interpretation Conventional Reciprocal Method (CRM) refraction data which aims to produce a seismic refraction data processing GUI using the Matlab programming language, so that it can know the wave velocity value and get 2D cross section. Data obtained in the form of wave propagation time as forward and reverse time, from the travel time of the wave and distance and time geophone analysis. From the results of the interpretation of the data obtained the velocity of P wave propagation in the medium and depth in 2 layers. In the first layer obtained a velocity value of 628.98 m / s with the depth of the first layer ranged from 0 m - 8.73 m, and the seismic wave velocity in the second layer was 1228.99 m / s with the depth of the second layer ranged from 8.73 m - 20 m. Based on the 2D model the distribution pattern of velocity values, it can be indicated that the first layer is the latosol soil layer containing sand, gravel, fine sediment and clay. And in the second layer contains fine deposits, sandstone, gravel, sand, fine sand (silt), clay and clay. These materials as a result of the process of the eruption of an undefined young volcano.

Keywords
conventional reciprocal method, seismic refraction data,wave propagation, forward and reverse time

Topic
Physics

Link: https://ifory.id/abstract/PyG7ExYWQHef

Corresponding Author
Rooselyna Ekawati

Institutions
Universitas Negeri Surabaya

Abstract
Covariational reasoning plays significant role for solving problems. This study examines the covariational reasoning of postgraduate students when solving mathematics problems such as fraction, velocity and acceleration, proportion, and integral. 26 postgraduate students of mathematics education are involved in this study. Generally, mental action of students more prominent on fraction and proportion than on the other issues. On fraction and proportion problems, all students are able to fulfill all mental actions such as coordinating the value, the direction, and the amount of change of one variable, and also coordinating the average and the instantaneous rate of change of the function. However, on velocity, acceleration, and integral problems students can not show their mental actions well. The shape of their graph are irrespective with initial point, so that they only fulfill 3 of 5 mental actions in covariational reasoning. These findings suggest that learning in mathematics should place increased emphasis on problem involving graph to promote covariational reasoning of the students.

Keywords
Covariational reasoning, postgraduate students, fraction, velocity, acceleration, proportion, integral

Topic
Mathematics

Link: https://ifory.id/abstract/BWMrRwF6ygma

Corresponding Author
Meiliasari Meiliasari

Institutions
Universitas Negeri Jakarta

Jurusan Matematika UNJ
Gd. Dewi Sartika Lt.6
Kampus A UNJ, Jalan Rawamangn Muka
Jakarta Timur

Abstract
This paper is a part of a larger study aiming to develop pre-service teachers- pedagogical content knowledge (PCK) through lesson study in a teaching practicum. PCK is often explored and discussed within the act of teaching. Since teaching cannot be separated from planning, the successfulness of a lesson is a result of how it is planned. This paper discusses pre-service teachers- PCK in the planning of a lesson study using the Knowledge Quartet framework. Case study methodology was used. Data for this paper were collected through video and fieldnotes from four lesson study groups in two secondary schools in Jakarta, Indonesia. It involved ten pre-service teachers, five mentor teachers and two lecturers. The analysis of the data shows that foundation, transformation, and connection dimensions of the Knowledge Quartet are evident in the planning. It also shows the interconnectedness of the three dimensions.

Keywords
Mathematics, Pedagogical Content Knowledge, Pre-service Teachers, Planning

Topic
Mathematics

Link: https://ifory.id/abstract/qTZu9wYJMU7n

Corresponding Author
Arionmaro Asi Simaremare

Institutions
a) PLN Research Institute, Jalan Duren Tiga No 102, Jakarta 12760, Indonesia

Abstract
Transmission lines plays important roles in delivering electric energy from generation site closer to the customer. Failure of a transmission line can cause significant economic loss due undelivered energy and may lead to catastrophic system black out. One critical part of transmission line is dead end connector, thus ensuring good condition of transmission line dead end connector is critical to avoid extensive losses. This paper investigates the cause of failure of dead end connectors that were installed in 150 kV ACSR lines. The failed connectors were examined and tested to find out the cause of the breakdown. Several samples of suspected bad connectors are also tested for comparison. Simulations using finite element software were conducted to provide broader insight on failure propagation. The investigation found that the dead end connectors were failed due to high current flowing through the steel part of the conductor which is caused by high contact resistance between the aluminum part of the conductor and the connector. Further study is needed to mitigate similar condition to occur in the dead end connector installation

Keywords
dead-end connector; contact resistance; finite element

Topic
Electrical Engineering

Link: https://ifory.id/abstract/TdQYX8ZF9RrE

Corresponding Author
Rizqi Darma Rusdiyan Yusron

Institutions
State Polytechnic of Malang

Abstract
Algorithms developed to identify people with iris image data have been tested in many field and laboratory experiment. This paper makes a parameter analysis of iris image used to recognize human. Iris recognition system, which is applied based on segmentation, normalization, encoding, and matching is also describe in this paper. Circle Hough Transform the segmentation module used to find the inner and outer boundaries of the iris. The experiment was carried out using CASIA v1 iris database with grayscale images. Shape, intensity, and location information for localizing the pupil or iris and normalizing the iris area a used iris segmentation the by unwrapping the circular area into a rectangular area. Normalized area will be used to extract the features using Gray Level Co-occurrence Matrix (GLCM) and Gabor filter, the feature compared the recognition accuracy using Support Vector Machines (SVM) and Naive Bayes classifiers. GLCM feature test results achieved 95.24% SVM classification accuracy, where as using achieved 85.71% Naive Bayes. Gabor feature test results achieved 95.24% SVM classification accuracy, where as using achieved 95.23% Naive Bayes. The classification process based on GLCM and Gabor features show that the SVM method have to highest recognition accuracy compare to Naive Bayes classifier.

Keywords
Gray Level Co-occurrence Matrix; Gabor Kernel Filter; Iris Feature; Feature Extraction

Topic
Computer Science

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

Corresponding Author
fajar fauzi abdullah

Institutions
a. Departement of Chemistry, Universitas Garut, Jl. Raya Samarang No.52A Garut, Indonesia.
*fajarfauzi[at]uniga.ac.id
b. Sultan Idris University of Education, Faculty of Mathematics and Sciences, Department of Chemistry, 35900 tg. Malim, perak, Malaysia.

Abstract
Objective: This study was to determine the antioxidant activity of marker compounds contained in Kaempferia galanga L. n-hexane extract, by isolating compounds from Kaempferia galanga L. n-hexane extract and examining antioxidant activity. Method: Kaempferia galanga L. dry powder was macerated with n-hexane for 3x24 hours. n-hexane extract was obtained and evaporated until the solution became 30mL then let it sit on the icebath, the residue obtained was then recrystallized with ethanol. The colorless crystalline solids obtained were then tested for antioxidant activity with the DPPH (1,1-diphenyl-2-pikrilhidrazil) method. Results: Spectroscopic analysis including UV Vis, IR, 1D-NMR and 2D-NMR showed that isolates were phenylpropanoid type compounds derived from hydroxycinamic acid in the form of ethyl-p-methoxy-cinnamic and strong intensity antioxidant activity indicated by IC50 value of 58,851 ppm. The benefits of this study can provide a basic knowledge of the utilization of the potential content of the main compounds from Kaempferia galanga L. for the pharmaceutical preparation field.

Keywords
Kaempferia galanga; Antioxidant Activity; Isolation secondary metabolites; ethyl-p-methoxy-cinnamate

Topic
Chemistry

Link: https://ifory.id/abstract/6yZDWe8zpUkx

Corresponding Author
Aditya Risandi

Institutions
1,2) Biology Department, 9th Floor Hasyim Ashari Building, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia
2) Universitas Negeri Jakarta Culture Collection, 9th Floor Hasyim Ashari Building, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia
3) Institute of Bioproduct Development (IBD), Universiti Teknologi Malaysia (UTM), 81130 UTM, Skudai, Malaysia
4) Department of Bioprocess and Polymer Engineering, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia

Abstract
Amylase (E.C.3.2.1.1) are the enzyme that can catalyse the hydrolysis of starch into simple monomers. Amylase enzymes are widely needed for use in various industrial fields such as the textile, food, paper and other industries. Yeast can produce enzymes more effectively and safer than other organisms. Amylolytic yeast can be isolated from flower substrates because it contains sugar for yeast nutritional needs. This study aims to isolate, select and characterize amylolytic yeast on the substrate of Paphiopedilum sp. from Bedugul Botanical Garden, Bali. Yeast isolation was carried out with direct and washing method. Screening was carried out on YPSA medium with diffusion agar method. The result of isolation obtained 19 isolates of yeast with characteristics of 73.9% white-mucoid, 21.05% cream-mucoid and 5.26% light flesh-mucoid. Screening results showed that 10 isolates were able to produce an amylase enzyme with code isolates P1, P4, P6, P10, P11, P12, P13, P14, P15 and P19. The potential yeast isolates in yielding amylase with P12 isolate codes had amylolytic index 0,45 mm.

Keywords
Amylase, Phapiopedillum sp., Yeast

Topic
Biology

Link: https://ifory.id/abstract/YTHb8fMBLJxW

Corresponding Author
Sri Ratna Dewi

Institutions
Faculty of Medicine and Health Science, Universitas Warmadewa, Bali-Indonesia

Abstract
Wastewater needs to be processed before being disposed. Generally the wastewater that produced by a hospital contains a lot of bacteria, viruses, chemical compounds, and drugs which can be harmful for the health of the surrounding community. For this reason, it is necessary to process hospital wastewater by using effective and efficient wastewater treatment technology. One of the processes of wastewater treatment is biological processing that use microorganisms. Aim of this study is to isolate microbial that produce proteolytic capabilities that are potential in treating hospital wastewater. This research is a descriptive study with cross sectional design. Samples were taken from the Waste Water Treatment Plant of Kasih Ibu General Hospital in Denpasar. The screening of the proteolytic bacteria was done by growing the isolated culture on skim milk agar. The colonies that produce clear zone were identified as proteolytic bacteria. In this study a total of 43 isolates were obtained and two isolates showed their proteolytic activity. Both isolates are Gram positive cocci and Gram negative bacilli.

Keywords
isolation; bacteria; hospital; wastewater; proteolytic

Topic
Biology

Link: https://ifory.id/abstract/yUGRjcnmAPX6

Corresponding Author
Lalu Zulkifli

Institutions
1)Deparment of Science Education, Faculty of Teacher Training and Education
Mataram University
*)Corresponding author : lalu_zulkifli[at]unram.ac.id

Abstract
Mangrove plants are widely used traditionally in treating various types of infectious diseases in the people of Lombok Island. This study aims to isolate and characterize endophytic bacteria from the roots, stems, leaves and fruits of mangrove Rhizophora mucronata Lam. which grows in Gili Sulat, and to determine their antibacterial activity against some patogenic bacteria, such as Escherichia coli, Staphylococcus aureus, Bacillus cereus and Pseudomonas aeruginosa. Media used for isolation were NA and TSA. Antibacterial activity tests were carried out with well diffusion methods, and the level of antibacterial activity refers to the category according to Vasanthakumari. Characterization of endophytic bacteria includes morphological of colonies, cell morphology, physiology. Eighteen (18) endophytic bacteria isolates were obtained. Results showed that 12 isolates of endophytic bacteria had moderate (8-12mm) to strong category (> 12mm) of their antibacterial activity against B. cereus and P. aeruginosa. Isolate of NBM2(1) gave the strongest antibacterial activity against B. cereus. It can be concluded that endophytic bacteria isolated from mangrove R. mucronata Lam. is highly potential to be developed as a new antibacterial source, especially against B. cereus pathogenic bacteria.

Keywords
Endophytic bacteria, Antibacterial activity, R. mucronata Lam..

Topic
Biology

Link: https://ifory.id/abstract/qwEQA2rzTNnB

Corresponding Author
Neneng Siti Silfi Ambarwati

Institutions
1Cosmetology Department, Faculty of Engineering, Universitas Negeri Jakarta, Jl. Rawamangun Muka, East Jakarta 13220, Indonesia.
2Faculty of Pharmacy, Universitas Indonesia, UI Depok Campus, Depok 16424, Indonesia.
3Research Center for Chemistry, Indonesian Institute of Sciences (LIPI), Kawasan PUSPIPTEK, Serpong, Tangerang, 15314, Indonesia.
4Faculty of Pharmacy, University of Pancasila, Srengseng Sawah, Jakarta, Indonesia.
5Chemistry Division, Centre for Foundation Studies in Science, University of Malaya

Abstract
Background. Garcinia latissima Miq. (Clusiaceae) grows on the island of Seram Maluku and Papua, but was cultivated in the Bogor Botanical Garden since May 11th 1994. Previous research has been done that ethyl acetate extract of G. latissima Miq. leaves with 2% concentration in dimethyl sulfoxide against Bacillus subtilis used agar diffusion method gave inhibition zone diameter 7.68 mm. The minimum inhibitory concentration (MIC) of the extract against B. subtilis was 5,000 ppm and the minimum bactericidal concentration (MBC) was 10,000 ppm. Purpose. The purpose of the study was to get isolate from G. latissima Miq. leaves ethyl acetate extract and to understand its activity against B. subtilis. Methods. The isolation was performed by open column chromatography, recrystallization, preparative thin layer chromatography and the isolate antibacterial assay by microdilution method. Spectroscopic characterization using ultra violet spectroscopy (UV-Vis), infra red spectroscopy (FTIR), 1H-NMR, 13C-NMR, DEPT, HSQC. Result. The isolated compound was white crystal, soluble in chloroform and insoluble in n-hexane, ethyl acetate. The melting point of the isolated compound was 262-264oC. IR spectrum showed strong signals for C-H stretching of methyl groups and carbonyloxygen (C=O). The based on NMR data, the chemical shifts of chemical compounds from the isolate was compared with the literature showed that the isolate was friedelin. The MIC of friedelin against B. subtilis was 2,500 ppm.

Keywords
Garcinia latissima Miq., isolation, characterization, antibacterial, Bacillus subtilis

Topic
Chemistry

Link: https://ifory.id/abstract/qxWBJfVc6bYt

Corresponding Author
Ardika Nurmawati

Institutions
Department of Chemical Engineering, Faculty of Industrial Technology, Sepuluh Nopember Institute of Technology (ITS), Kampus ITS Sukolilo Surabaya, 60111, Indonesia

Abstract
The addition of alcohol as an oxygenated compound, affect the vapor pressure of gasoline. In this study, the vapor pressure of isobutanol – isooctane/n-heptane blends were investigated. Vapor-liquid equilibrium data for the binary systems of isobutanol + isooctane/n-heptane were measured at low temperatures ranging from 303.15 to 323.15 K. The measurement was carried out using simple quasistatic ebulliometer. The apparatus validated by comparing the vapor pressure of pure isobutanol, isooctane, and n-heptane with the published data and average absolute deviation (AAD) obtained was less than 0.83%. The vapor pressure of the binary mixtures correlated with the Wilson, Non-random two-liquid (NRTL), and Universal quasichemical (UNIQUAC) models. The AAD for isobutanol + isooctane system were 1.54%, 1.44%, 1.71% respectively and for isobutanol + n-heptane system were 1.73%, 1.65%, 1.99% respectively. The vapor pressure from the experiment for all systems shows a positive deviation from Raoult-s Law that indicates a nonideal solution.

Keywords
Vapor pressure, Isobutanol, Isooctane, N-heptane

Topic
Chemical Engineering

Link: https://ifory.id/abstract/7keZBp9vGQ4M

Corresponding Author
solihin solihin

Institutions
Department of Out-of-School Education, Faculty of Education, Jakarta State University
Biology Education – Faculty of Mathematics and Natural Sciences – Jakarta Islamic State University* solihinone[at]yahoo.com
Indonesian education university. Dr. Styabudi 229 Bandung
Asmis business and multimedia institute

Abstract
This study investigated the contribution of a Cooperative Instructional Strategies in developing academic discussion. Academic discussion is an important element of historical thinking, which is considered to improve conceptual understanding and support the development of democratic citizenships by helping students interpret, understand and connect patterns of human activity across time in environment. Adult learner as research conditions, participated in this study. The outcome variables discussed in the paper are adult learner self-esteem and classroom climate. Over the period of the study, cooperative learning did not significantly improve the self-esteem of adult learner. However, adult learner in the experimental group who were taught through the cooperative learning approach perceived classwork to be less difficult than the control adult learner who worked individually. The control adult learner also reported a decline in satisfaction with classwork and perceived more friction in their class. Interviews with the instructor and adult learner showed favourable attitudes toward cooperative learning.

Keywords
Cooperative learning, classroom climate, environment, self-esteem, affective outcomes, adult learner perceptions

Topic
Biology

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

Corresponding Author
Dahlia Fisher

Institutions
1Department of Mathematic Education, Postgraduate School, Indonesian Education University, Jl. Setiabudi No. 229 Bandung.
2 Fakultas Keguruan dan Ilmu Pendidikan Unpas, Jl. Tamansari No.6-8 Bandung 40116.

Abstract
Abstract. This study aims to determine students mathematical reasoning abilities on systems of linear equations and aplications. This research was conducted in the odd semester of the 2018/2019 academic year. The population in this study were all students of class VIII in one of the Junior High School in Bandung with a total sample of 32 students. The research instrument used in the form of test mathematical reasoning abilities. The research method used is qualitative research design. Data were analyzed using data reduction, data presentation, and conclusion. Based on the results of the study it can be concluded that the mathematical reasoning ability of junior high school students in systems of linear equations and aplications is still low.

Keywords
mathematical reasoning ability, systems of linear equations and aplications.

Topic
Mathematics

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

Corresponding Author
BAMBANG HERU ISWANTO

Institutions
Department of Physics, Universitas Negeri Jakarta, Jakarta 13220, Indonesia

Abstract
Water level measurement is a very important task, especially to obtain information about the availability of water in a reservoir or overflow of river water in flood management. In this paper, we investigate the water level management using ultrasonic sensor to get data in real time. The monitoring system consist of an ultrasonic sensor, LCD displays, and resource tank interfaced with Arduino. To improve the accuracy of the measurement results we introduced the Kalman filter, an algorithm that uses a series of measurements observed over time to produces estimates of unknown variables by estimating a joint probability distribution over the variables for each time frame. This technique is applied for improving the precision of trace water levels based on ultrasonic sensors in the presence of various noise sources. Filter performance is demonstrated to be adaptive to real-time noise. The effectiveness of this technique is evaluated by measuring the water level in the disturbed container with three different levels. Experiment results indicated reducing the errors of measurement significantly up to 60% for a high disturbed water level condition.

Keywords
Kalman filtering, ultrasonic sensor, water level measurement

Topic
Physics

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

Corresponding Author
syahminan syahminan

Institutions
Universitas Kanjuruhan Malang

Abstract
Abstract land Agricultural, especially in South Malang Regency, where the majority of the population is the majority of the population working as farmers. The agricultural area known as Malang Regency, around 15.74% (49,593 hectares) is wetland, 31.31% (98,641 hectares) are fields. Not all types of vegetable plants can flourish on every farm, because each region has different characteristics. Therefore, to help determine the type of crop that is suitable, a waterful method is needed by specifying user requirements with planning planning stages, modeling, construction, and systems, to help determine land identification decisions as crop farming food. KN (Nearest neighbor). With a decision support method for identifying land for food crop cultivation, it will be easier to determine the type of plant that is suitable for soil conditions to increase agricultural productivity in South Malang district.

Keywords
Keywords: KNN identification of land agricultural

Topic
Computer Science

Link: https://ifory.id/abstract/jNU8rzGkv4KL

Corresponding Author
Dewa Ayu Putri Sri Masyeni

Institutions

Faculty of Medicine and Health Sciences, University of Warmadewa

Abstract
Acquired Immune Deficiency Syndrome (AIDS) is a collection of symptoms caused by Human Immunodeficiency Virus (HIV). Bali is the 4th region with the largest number of HIV cases in Indonesia. Data from the Denpasar Health Office stated that the highest number of HIV / AIDS cases was in South Denpasar District with 558 cases. Community leaders as a sample in this study considered to have a great influence on the community in the environment. The purpose of this research is to identify knowledge about HIV / AIDS and attitude of public figure to PLHIV patient especially in South Denpasar. This research is descriptive with cross sectional approach to 96 public figures in South Denpasar selected by using multi-stage random sampling technique. Data collected through questionnaires that have been tested for validity and reliability. The result of community leaders who have good knowledge as many as 39 respondents (40.6%), quite as much as 57 respondents (59.4%) but there are no respondents with less knowledge category. In the category of attitude there are 50 respondents (52.1%) with good category, 39 respondents (40.6%) with enough category and 7 respondents (7.3%) with less category. This study is expected to be useful as a basis for further education to reduce transmission and increase HIV / AIDS prevention efforts and reduce the negative stigma and rejection of PLWHA and theoretically can be a reference in subsequent research.

Keywords
Knowledge, Attitude, PLWHA, HIV / AIDS

Topic
Biology

Link: https://ifory.id/abstract/qXD4hZcd7ypE

Corresponding Author
Halimatus Sadiyah

Institutions
(a) Biology Education Department, State University of Jakarta, Jalan Rawamangun muka, Jakarta 13220, Indonesia.
*nurmasari_sartono[at]yahoo.com

Abstract
The limited information that is only in the form of text and images in the practicum guide that already exists causes various obstacles experienced by students in biology labs. The smartphone application comes with the potential to combine information in the form of text, images, videos and quizzes as a medium for student learning. This study aims to see the effect of the use of smartphone biology practical guide applications on the ability of science processes of students using quasi-experimental methods with pre-post-test control group design research design. The conclusion obtained is that the use of biological practicum guidance application has a positive influence on students scientific process abilities.

Keywords
laboratory manual, smartphone, psychomotoric, outcome.

Topic
Biology

Link: https://ifory.id/abstract/DCPqVHvkTBA6

Corresponding Author
Prayang Sunny Yulia

Institutions
a. Petroleum Engineering Department, Faculty of Earth Technology and Energy, Universitas Trisakti-Jakarta
*prayang[at]trisakti.ac.id

Abstract
The needs of petroleum as energy, have increasing while the oil production has depleting. Due to that needs, the method of Enhanced Oil Recovery (EOR) or in other hands as tertiary recovery (after primary recovery and secondary recovery) is being developed. EOR has many methods; one of the methods is chemical injection that consists of surfactant, alkaline and polymer. In this experiment, the author is using surfactant injection. The using of surfactant is to decrease the interfacial tension between oil and water, with the result is surfactant can displace oil through rock pores. This study will be discussing about the effect of salinity, surfactant types and surfactant concentrations on surfactant injection for carbonate rock. Surfactant types that will be used are Alpha Olefin Sulfonate (AOS) and Tween 20. Each surfactant type has its concentration varieties as 0,1%; 0,25%; 0,5%; 0,75% and 1%. Salinity varieties of brine water are 10.000 ppm; 15.000 ppm; 20.000 ppm and 25.000 ppm. From this study, it will determine that how capable surfactant can displace the oil from rock pores, based on the influence of salinity, surfactant concentrations and surfactant types to recovery factor. The determination of recovery factor will be using these methods; Amott apparatus (imbibition process) and injection using core holder and syringe pump. The expectations from this study is there will be get the best result from many parameters of surfactant and brine water salinity to improve the recovery factor, especially on carbonate rock.

Keywords
EOR, surfactant, recovery factor, carbonate

Topic
Chemical Engineering

Link: https://ifory.id/abstract/DehUEn4uNw6M