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The 3rd International Conference on Sustainability and Innovation (ICoSI 2019)

Event starts on 2019.07.30 for 2 days in Yogyakarta

http://icosi.umy.ac.id | https://ifory.id/conf-abstract/VtN7hkMnz

Page 13 (data 361 to 390 of 1365) | Displayed ini 30 data/page

DRUG ABUSE AND RELAPSE PREVENTION MECHANISMS: PHENOMENOLOGICAL STUDY ON THE LIVED EXPERIENCES OF FORMER DRUG USERS IN YOGYAKARTA INDONESIA
Yanuar Fahrizal (1*), Achir Yani Syuhaime Hamid (2), Novy Helena Catharina Daulima (2)

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Corresponding Author
Yanuar Fahrizal

Institutions
1)School of Nursing, Universitas Muhammadiyah Yogyakarta, Indonesia
*yanuarfahrizal89[at]gmail.com
2)Faculty of Nursing, Universitas Indonesia

Abstract
The relapse of drug abuse is the most difficult problem that former drug users face. This problem will continue to exist through the person who uses drug had stopped using the drug. The process of recovery was a process where drug users did to stop using drugs and this process could be affected by many factors. The study aims to explore former drug abusers experiences in an attempt to stop using drugs and relapse prevention. Qualitative research design with a phenomenological approach was used in this study. Eight former drug users in Yogyakarta were involved as participants. Data collection through the conduct of in-depth interviews within 60-90 minutes for each participant. Data analysis used was the Collaizi seven stages method. Three emergent themes were drawn: internal drug abuse triggers in relapse, external triggers in the relapse of drug abuse, and memorable life events in which drug abusers stop using drugs, such as family, religious/religious, government policy, police arrests and drug outbreaks. The conclusion to this study was that there was an induced factor in the relapse of drug abuse stemmed from internal and external factors and the protective factor of self-awareness in drug abuse prevention efforts developed from the most important event of the lives of former drug abuse.

Keywords
drug users; self-awareness; relapse prevention; drug abuse

Topic
International Conference on Nursing

Link: https://ifory.id/abstract/HxubQKkYB4rj


Dry Anaerobic Fermentation with the Addition of S. cereviseae on the Various Ratio of Organic Waste and Cow Feses in Biogas Production
Tami Rahma Lestari (a*), Gemilang Lara Utama (b), AB Susanto (c)

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Corresponding Author
Tami Rahma Lestari

Institutions
a. Faculty of Sciences and Technology, Universitas Wanita Internasional
b. Faculty of Agroindustrial Technology, Universitas Padjadjaran
c. Faculty of Fisheries & Science Marine, Universitas Diponegoro

Abstract
Organic waste should be used to minimize environmental problems. Organic waste can be mixed with Saccharomyces cerevisiae and cows manure as a raw material of biogas production. Appropriate Saccharomyces cerevisiae dose and cows manure are needed to get the best biogas production with distillery sludge as fertilizer that meets the standards. This research is aimed to determine whether organic waste utilization with addition of Saccharomyces cerevisiae and cows manure provides good biogas production. Research was done experimentally based on Completely Randomized Design 4 x 3 with factorial patterns. Treatments consisted of three factors, namely the addition of different Saccharomyces cerevisiae concentrations (0 gr, 2 gr and 4 gr) and combination of organic waste and cows manure ratio (1:0, 2:1, 1:1, 1:2 v/v) with three replications. The result showed that 2 gr of Saccharomyces cerevisiae on kitchen waste and cows manure with ratio 1:1 (F2S1) can produce 0,0128m3 with a decrease in the C / N ratio of 60.07% and the final pH of sludge 6.81.

Keywords
biogas, S.cereviseae, organic waste

Topic
International Conference on Sustainable Agriculture

Link: https://ifory.id/abstract/8z7yxMAVtdYn


Durability of K-300 concrete on peat water in the Palangka Raya
Noviyanthy Handayani, Lebdo Sumawirawan

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Corresponding Author
Noviyanthy Handayani

Institutions
Program Studi Teknik Sipil
Fakultas Teknik
Universities Muhammadiyah Palangkaraya
Jl. RTA. Milono km. 1,5 Palangka Raya 73111

Abstract
Peat water in the City of Palangka Raya has a high degree of acidity, which is indicated by a pH level of 4.5. Acidic water will affect the physical and mechanical properties of concrete and make the concrete corrosive. This is the background of this research. This research was conducted to determine the effect of peat water on the concrete quality of the original plan of 300 kg/cm2. Analysis was carried out on soaking concrete on peat water for 30 days, 60 days and 90 days. As a comparison, water from the Kahayan river is used. The test results showed that the concrete soaked in peat water 30 days, 60 days and 90 days showed an average compressive strength of 223.98 kg/cm2, 227.75 kg/cm2 and 209.65 kg/cm2. Whereas the concrete which was immersed with Kahayan river water showed an average compressive strength of 234.54 kg/cm2, 254.90 kg/cm2, and 215.68 kg/cm2. It can be concluded that the concrete soaked in peat water shows a decrease in the strength of concrete as much as 26.5% while Kahayan river water by 21.6%.

Keywords
Concrete, peat water, Kahayan river water

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/8xRj7NuqendH


DYNAMIC ASSESSMENT EFFECT ON SPEAKING PERFORMANCE OF INDONESIAN EFL LEARNERS
Fahmi, Bambang Widi Pratolo, Nurul Ihsan

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Corresponding Author
Fahmi Fahmi

Institutions
Universitas Ahmad Dahlan, Jl.Pramuka Kav.5,Yogyakarta 55161, Indonesia
Email:okfahmi50[at]gmail.com

Abstract
The research concerns on the application of Dynamic Assessment (DA) in Teaching and learning. Dynamic Assessment is based on theory of Vygotsky-s, zone of proximal development (ZPD). The research is intended to investigate the effect of Dynamic Assessment (DA) in improving teaching and learning speaking of Indonesian EFL learners. DA application is used as alternative assessment which is purposively attached in Teaching English on Indonesian learners. It is focused to improve learners speaking performance by analyzing the non-fluency, the insight of students difficulties, and the needs of students. The deep analysis is obtained from learners- self-evaluation and interviews on their speaking performance. The analysis shows that the learner-s speaking performance are improved after experiencing DA session. The findings shows some positive effects of DA on learners- speaking performance which can be seen in: (1) the results of the pre-test, post-test and learners- self-evaluation during DA session. (2) learners- attitude toward DA in interview reports. From the results of the test and self-evaluation obviously describe their speaking was improved significantly. In interviews, learners show positive experiences, and attitude toward DA since it serve them a comfortable, structured, practical and meaningful platform to recognize their speaking behavior, weaknesses, strength, and needs. This study also describes incredible results that DA serves the learners to get an objective feedback, but not being objectified or judged.

Keywords
Dynamic Assessment; Speaking Performance; Indonesian EFL learner

Topic
International Conference of English Language Teaching, Literature & Linguistics

Link: https://ifory.id/abstract/rbx4YW8JP9mK


Dynamic Characteristic of Partially Debonded Sandwich Based on Real Contact and Spring Model Discretization: A Numerical Simulation
Tuswan (a), Achmad Zubaydi (a*), Agung Budipriyanto (b)

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Corresponding Author
Tuswan ST

Institutions
(a) Department of Naval Architecture, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
*zubaydi[at]na.its.ac.id
(b) Department of Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

Abstract
Partially debonding at the skin/core interface during fabrication and/or in-service life is recognized to be the primary pre-failure modes in the ship sandwich structure. The vibration-based damage detection approach is a promising option to ascertain damage existence. The numerically dynamic behavior subjected to harmonic loading of partially debonded sandwich is investigated using two model discretizations: spring element and real contact model. The material consists of two thin steel skins bonded to the lightweight core of resin/clamshell powder. The considerable influence of the debonding ratio, location, shape on the structural modal parameters (natural frequency, mode shape, and structural time history dynamic responses) based on two model discretizations is rigorously compared. To be confident in results of the numerical analysis, an experimental modal analysis of initial model is carried out to validate the correctness of the FE model. It is recognized that the spring element method is less convenient for handling the debonding problem than the surface contact definition. The result shows that the higher natural frequencies and mode shapes are more sensitive to the debonding presence. The results demonstrate that both methods can be useful for assessing practical problems related to the non-destructive damage detection in ship structure.

Keywords
Steady-state Dynamic, Sandwich, Debonding, Finite Element, Ship Structure

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/6KVY9RwnQCzp


Early Childhood Educational Role Play (Phenomenology study of Bhayangkari 29 Kindergarten in Jambi)
Fatma Asmi Agus, Maruf Akbar, Soegeng Santoso

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Corresponding Author
Fatma Asmi Agus

Institutions
UNIVERSITAS NEGERI JAKARTA

Abstract
The aim of this research is to obtain information about the dramatic play with an fenomenology study in TK Bhayangkari 29 Jambi The data were collected through participant observation using interview, observation, document study and recording. The evaluation tecnigue of study validity is conducted with criteria of validity level, dependency, and assurance. Meanwhile, data analysis process includes: arrangement, array, classification, coding, and categorizing the data obtained fron various sources, field records, response, and documentation. This research found that learning with dramatic play method will be able to develop multy intelligence dan childrens linguistic intelligence. Because by the dramatic play, children will gain various vocalbularies, sentences, communicate, and practice to write. Therefore, this research recommends to use dramatic play in learning children in orther to development their linguistic intelligence.

Keywords
Linguistic intelligen, dramatic play, development, fenomenology

Topic
International Symposium on Social Sciences, Humanities, Education, and Religious Studies

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


EARNED VALUE MANAGEMENT SYSTEM IN INDONESIAN CONSTRUCTION PROJECT
Mandiyo Priyo

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Corresponding Author
Mandiyo Priyo

Institutions
Universitas Muhammadiyah Yogyakarta

Abstract
Earned Value Management (EVM) is a methodology that combines scope, schedule, and resource measurements to assess project performance and progress, it involves the integration of the three key elements of the project which are scheduled, work scope, and cost. Based on the literature, various benefits have been associated with the use of EVM in project management. The research aims to analyze four units of building construction project using earned value management method which consists of an analysis of project performance, estimates of cost and time for project completion and analysis of planning estimation against project completion. Based on the analysis uses earned value management in four building projects above, from the aspect of time: three buildings were completed ahead of schedule and one building was completed behind of the schedule. At the same time, from the aspect of cost, three buildings spend cost under of the budget and the actual cost of one building is higher than the estimated budget.

Keywords
Earned value management, construction, project management

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/2qkxVCuHMUJg


EcoBot (Eco-Friendly Bottle for Diabetics) Innovation of Eco-Friendly Bottle as Automatic Sugar Container for Diabetes Mellitus Sufferer
Setyawan Wahyu Pratomo (a*), Dzata Farahiyah (b) , Andhikajati Kurnia Adi(b), Aditya Sandi Nugraha(b), Halida Ulfah(b)

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Corresponding Author
SETYAWAN WAHYU PRATOMO

Institutions
(a) Department of Electrical Engineering, Faculty of Industrial Technology, Universitas Islam Indonesia
* setyawan.wahyu[at]uii.ac.id
(b) Faculty of Industrial Technology, Universitas Islam Indonesia

Abstract
Diabetes Mellitus prelevance in Indonesian society caused by lifestyle that is excessive energy intake while the activity decreases increasingly. Nowdays, people are eating food that contain rich of energy like sugar. The purpose of this paper is to present EcoBot (Eco-Friendly Bottle for Diabtics) a solute tool to overcome Diabetes Mellitus problem in Indonesia. The research method is using QFD method.This method is divided into several parts, namely planning, implementation, evaluation, and action. Planning is done to identify the problem that is analysis of daily sugar consumption, identifying materials and tools, and data collection as a reference tool design and conduct research on the data that has been collected. Implementation is done to product design and product production. The evaluation is to test the products to society. Actions are mass production, copyright registration, and registering patents for EcoBot. The mechanism of work of this tool is using NodeMcu, LED and photodiode , servo, LCD, and android application. The expected result is hopefully EcoBot be able to contribute in reducing and preventing Diabetes Mellitus in Indonesian society.

Keywords
Consumption;Diabetes Mellitus; EcoBot; Sugar;

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/GhBavYd63TqJ


Edutainment with the volcanic media for childrens language development in group B at TK X Kamal, Bangkalan
Dwi Nurhayati Adhani M.Psi (a), Ainin Shofiyah S.Pd(b)

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Corresponding Author
DWI ADHANI

Institutions
(a)Universitas Trunojoyo Madura
(b)TK Dian Ceria Surabaya

Abstract
This study aims to look at the development of language owned by group B children in TK X Kamal, Bangkalan by using edutainment. On the implementation of using mountain media erupted by performing a volcanic eruption process simulation. Learning about volcanic eruptions is expected to be able to recognize the surrounding environment, and explain the symptoms of nature. This study uses quantitative descriptive research to determine the number of students who can describe the process of erupting the mountain verbally. The location of this study was conducted at TK X kamal Bangkalan with a total of 16 students. The results of this study were to look at the language development of children in group B in explaining natural phenomena such as volcanic eruptions.

Keywords
Edutainment, Language development

Topic
International Conference of English Language Teaching, Literature & Linguistics

Link: https://ifory.id/abstract/cAnbW2YTkLqj


EFECT OF Na2SO4 AND (NH4)H2PO4 AS PRECIPITATATION AGENT ON EXTRACTION ACTIVE MATERIAL OF HEMATITE (α–Fe2O3) AS ANODE LITHIUM-ION BATTERY
Evanisia More1, Aulia Mutiara Hikmah 2LOA Nur Ramadhan3, Achmad Subhan4, Lukman Atmaja1a

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Corresponding Author
Evanisia More

Institutions
1 Department of Chemistry, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
2 Department of Chemistry, Halu Oleo University, Mokodompit, Indonesia
3Physics Research Center, LIPI, Puspitek Serpong Area, Banten, Indonesia

Abstract
The research aim is to analyse the effect of consentration of presipitate agent Na2SO4 and (NH4)H2PO4 addition on α–Fe2O3 synthesis as active anode with Chitosan-PVA binder for lithium-ion battery. Hematit were extracted from Southeast Sulawesi area by hydrothermal method and Chitosan. Comparison of precipitate agents used is 1: 1 and concentrations varied at 0.1, 0.25, 0.5, 0.75, 1.0 and 1.5 M. FTIR, SEM, PSA and XRD were conducted to determine the physical properties of extracted material. Performance tests on the anodes that have been assembled in lithium ion batteries included EIS, CV and CD. The optimum condition is at 0.25 M with EIS and CD results of 1069 Ω and 428.45 mAh/g, respectively. The CV results have shown a reduction potential at 0.248 V and an oxidation potential of 1.648 V. The local iron sand of Southeast Sulawesi with the addition of precipitate agents can be used as a source of the active material for the anode.

Keywords
irond sand, Lithium-Ion Battery, hematite, Chitosan-PVA, Na2SO4, (NH4)H2PO4.

Topic
International Symposium on Social Sciences, Humanities, Education, and Religious Studies

Link: https://ifory.id/abstract/pRm8QWPbUyvT


Effect Analysis of the Selection Method for Calculating Time of Concentration and Rainfall Plans for The Design of Open Channels in Open Pit Mining.
Tedy Agung Cahyadi(a) , Angelina Metta(b), Sudaryanto(a), Charles Andrianto(c), Suyono(a), Eddy Winarno(a)

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Corresponding Author
Angelina Metta Arilia

Institutions
(a) Lecturer of Universitas Pembangunan Nasional Yogyakarta, Indonesia. Jl. SWK 104, Condongcatur, Depok, Kecamatan Depok, Ngropoh, Condongcatur, Kec. Depok, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55283
(b) Student of Universitas Pembangunan Nasional Yogyakarta, Indonesia. Jl. SWK 104, Condongcatur, Depok, Kecamatan Depok, Ngropoh, Condongcatur, Kec. Depok, Kabupaten Sleman, Daerah Istimewa Yogyakarta 55283
(c) Senior Hydrogeology engineer PT. ANTAM UBPN Pomalaa, Kolaka, Sulawesi Utara

Abstract
In designing the dimensions of the open channel in open pit mining, there are factors that should be considered including rainfall intensity, runoff coefficient, and catchment area. These three main factors will determine the amount of runoff water entering the pit and affect the dimensions of the open channels that are expected to handle the runoff water discharge. This research aims to analyse the effect of selection method for calculating time of concentration and rainfall plans for the dimensions of the drainage that are needed to handle the runoff water. This research uses primary data from direct observation on the field and secondary data based on rainfall data from BMKG station. Izzard, William, and field observation method are used to determine the time of concentration, while maximum, average, and minimum method are used to determine the rainfall plans. Both factors are greatly influence the value of rainfall intensity. The results of this research are open channel (drainage) dimensions which are calculated based on rainfall intensity which is first calculated using the analysis of several methods. It is expected that the results are appropriate and in accordance with the needs of the mine openings so that mining operations can run smoothly.

Keywords
Open Channel, Time of Concentration, Rainfall plans, Rainfall Intensity, drainage system, Izzard Method, Williams Method

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/7vFamPYCu439


Effect of Adding Polypropylene Fibres to Flexural Strength of Ferrocement
Fathoni Usman (a*), Syazwan Shaharuddin (a), Noor Mahmudah (b) and Monita Olivia (c)

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Corresponding Author
Fathoni Usman

Institutions
(a) Institute of Energy Infrastructure, Universiti Tenaga Nasional, Kajang 43000, Selangor, Malaysia
*fathoni[at]uniten.edu.my
(b) Department of Civil Engineering, Universitas Muhammadiyah Yogyakarta, Bantul 55183, Indonesia
(c) Department of Civil Engineering, Faculty of Engineering, Universitas Riau, Pekanbaru 28293, Indonesia.

Abstract
The development of a lightweight structure is being a growing trend in the construction industry all over the world. Ferrocement, a thin-shell concrete reinforced with layers of continuous wire mesh, had seen as an alternative material for this type of construction. However, due to the small thickness and large surface area of the ferrocement, potential of cracks due to drying shrinkage is high. In this study, Polypropylene fibres (PPF) was added to ferrocement mortar as secondary reinforcement. This paper presents the effect of adding PPF to the flexural strength of ferrocement. It was found that under flexural test, 66.6% of the variation in flexural strength of ferrocement was influenced by volume fraction, Vr; 31.4% by percentage of PPF, Pf and 2% by the interaction of Pf and Vr.

Keywords
Ferrocement; Polypropylene Fibers; Flexural Strength

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/4fanM9u7zhbH


EFFECT OF BEHAVIOR AND ENVIRONMENT ON COMMOND COLD IN CHILDREN
ArfahHusna; ArfrianiMaifizar; Enda Silvia Putri; Marniati

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Corresponding Author
Arfah Husna

Institutions
PUBLIC HEALTH FACULTY, TEUKU UMAR UNIVERSITY

Abstract
Introduction common cold is a disease caused by rhinovirus which will heal by itself because the life span of the virus is limited. Cases of cold commissions in Meureubo puskesmas in 2018 were 147 cases. The purpose of the study was to determine the effect of knowledge, attitudes, actions and environment on the incidence of Commond Cold in children in the Work Area of Meureubo Health Center in West Aceh Regency. The method of researched wass an analytical survey with cross sectional design, a population of 60 people and a sample of 60 people which is a total sampling, the data were analyzed using simple linear regression analysis. The results of the study have an influence between knowledge (value of regression coefficient 0.713 and significant 0.000), attitude (regression coefficient value 0.675 and significant 0.000), action (regression coefficient value 0.639 and significant 0,000), and environment (regression coefficient 0.518 and significant 0.000) Commond Cold in children. The conclusion is the influence between knowledge, attitudes, actions, and environment on Commond Cold in children. The Recomended to the Meureubo Health Center are expected to be able to provide information to the community about Commond Cold disease, how to prevent and treat Commond Cold in children.

Keywords
Commond Cold, Behavior, Environment

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/u3PfZcrx7pa8


EFFECT OF BOKASHI BANANA PEEL AND IMPERATA MULCH APPLICATION ON GROWTH AND PRODUCTION OF MAIZE (Zea mays L.)
Safruddin, Cik Zulia

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Corresponding Author
Safruddin Safruddin

Institutions
Department of Agrotechnology, University of Asahan, Indonesia

Abstract
This research was conducted at the Experimental Garden University of Asahan, Faculty of Agriculture, Kisaran Timur Subdistrict, Asahan Regency, with flat topography, type C climate according to Oldeman and place height around 20 m asl. The research was conducted from June to August 2018. The research was conducted using factorial randomized block design (RBD) consisting of bokashi banana peel fertilizer as the first factor with 3 treatment levels, namely: P0 = 0 kg/plot, P1 = 3 kg/plot, P2 = 6 kg/plot and imperata mulch as the second factor with 4 levels, namely: A0 = 0 kg/plot, A1 = 0.8 kg/plot, A2 = 1.6 kg/plot, A3 = 2.4 kg/plot. The best dose bokashi banana peel is given in 6 kg/plot (P2) which produces 142.28 cm plant height, 845.49 cm2 leaf area, 1.75 kg production per sample plant, and 8.71 kg production per plot. While for production per hectare is 21 tons. Imperata mulch application has no effect on plant height and leaf area. However, it has a significant effect on the parameters of production per sample plant of 1.71 kg and production per plot of 8.38 kg with treatment of 2.4 kg/plot (A3). The interaction of bokashi banana peel and imperata mulch application showed no significant effect on all observed parameters.

Keywords
bokashi banana peel, imperata mulch, maize (Zea mays)

Topic
International Conference on Sustainable Agriculture

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


Effect of CaCO3 Particle Size and Content on Impact Resistance of Kenaf/CaCO3/Epoxy resin Hybrid Composites
Harini Sosiati a*, Cahyo Trisedyo Utomo b, Iwan Setiawan c, Cahyo Budiyantoro d

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Corresponding Author
Harini Sosiati

Institutions
Universitas Muhammadiyah Yogyakarta

Abstract
Thermoplastic and thermoset polymer composites reinforced with kenaf fiber or CaCO3 have been extensively investigated. However, the study on the combination of kenaf fiber and CaCO3 reinforced epoxy resin is rare. This research discussed the effect of CaCO3 particle size and the ratio of kenaf to CaCO3 content on the impact strength of alkali-treated kenaf to CaCO3/epoxy resin hybrid composites. 30 % of the hybrid kenaf fibers and CaCO3 particles reinforced epoxy resin composites were fabricated by hand lay-up technique at  4 MPa for 12 h. Impact test of the composite specimens was conducted using a Charpy Impact test according to ASTM D 6110. The morphology of impact fracture surface was examined by scanning electron microscopy (SEM). The results showed that the impact strength of the hybrid composite increased with the decrease of CaCO3 particle size, and the ratio of kenaf to CaCO3. Interfacial bonding between the reinforcement (kenaf and CaCO3) and epoxy resin matrix, the uniform dispersion of kenaf and CaCO3 within the epoxy resin matrix are two crucial factors influencing the impact strength of the composite.

Keywords
Kenaf; CaCO3; hybrid composite; impact strength; SEM

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/hpX4EaTDYWtn


Effect of chitosan-zinc oxide coated in PVDF membrane; morphology and performance testing
A Febriasari (a*), D Siswanta (b), N Riyanto (a), N Hidayat Aprilita (b), F Silvianti (c)

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Corresponding Author
Arifina Febriasari

Institutions
(a) Department of Chemical Engineering, Universitas Serang Raya

(b) Department of Chemistry, Universitas Gadjah Mada

(c) Department of Rubber and Plastic Processing Technology, Politeknik ATK Yogyakarta

Abstract
PVDF membrane modification has been done by coating it using chitosan which is mixed with zinc oxide. This study was conducted to determine the effect of chitosan-zinc oxide on PVDF membrane hydrophobicity and performance. The coating has been processed by immersing PVDF membrane into a chitosan-zinc oxide hybrid solution with a ratio chitosan : zinc oxide of 1: 0 (M1), 6: 1 (M2), 4: 1 (M3), and 2: 1 (M4). Membrane morphology characterization was carried out by FE-SEM and FTIR. Water contact angle analysis and performance test was conducted to determine the effect of chitosan and zinc oxide

Keywords
Membrane, polyvinylidine flouride, zinc oxide, performance test

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/gDd38vzjB7Kq


Effect of Corporate Governance on Relationship Between Corporate Social Responsibility and Firm Size with Earnings Management
Gemi Ruwanti (a*), Grahita Chandrarin (b), Prihat Assih (b)

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Corresponding Author
Gemi Ruwanti

Institutions
a)Management Deapartment, STIE Indonesia Banjarmasin
Jl. Brigjen Hasan Basry 11-12 Banjarmasin, Indonesia
*gemi[at]stiei-kayutangi-bjm.ac.id
b)Graduate Program, Universitas Merdeka Malang
Jl. Terusan Dieng 62-64 Malang, Indonesia

Abstract
The study aims to examine the effect of corporate social responsibility and firm size on earnings management, and examine the role of corporate governance as a moderating variable in the relationship between corporate social responsibility and company size with earnings management. The variable corporate social responsibility is measured by the amount of CSR costs, and the size of the company is measured by total assets. Corporate governance is measured by the proportion of independent commissioners. The concept of earnings management that adopts the Modified Jones Model developed by Dechow et al. (1995) measured using a discretionary accruals proxy. The study samples are manufacturing company listed on the Indonesia Stock Exchange for the period 2014-2017. The analysis technique uses Moderated Regression Analysis (MRA). The results of the analysis show that corporate social responsibility and company size have a significant positive effect on earnings management. Companies that report corporate social responsibility tend to do earnings management. Corporate governance weakens the relationship between corporate social responsibility and earnings management, which means that companies that are socially responsible, are willing to spend effort and resources to carry out corporate social responsibility activities and strive to meet the ethical expectations of shareholders to the community, which tends to limit practice earnings management so that it will provide more transparent and reliable financial information to investors. Corporate governance weakens the relationship between the size of the company and earnings management. The larger the company as measured by total assets tends to reduce earnings management actions.

Keywords
corporate social responsibility, firm size, corporate governance, earnings management

Topic
International Conference of Islamic Economic and Financial Inclusion

Link: https://ifory.id/abstract/6AVTPBn7wvXD


EFFECT OF DIABETES MELLITUS SELF MANAGEMENT EDUCATION TOWARD SELF CARE BEHAVIOR OF TYPE 2 DM PATIENTS
Ratna Agustiningrum (a*), Arlina Dewi (b)

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Corresponding Author
Ratna Agustiningrum

Institutions
Master of Nursing Muhammadiyah University of Yogyakarta

Abstract
Ratna Agustiningrum (a), Arlina Dewi (b) (a) Student Master of Nursing Muhammadiyah University of Yogyakarta (b) Lecturers of Nursing in Muhammadiyah University of Yogyakarta Background : Diabetes has become one of the main threats to human health in the 21st century, the development of society in the present causes changes such as eating patterns, lack of physical activity and unhealthy behavior contribute to the causes of various diseases, one of them is Diabetes Mellitus (DM). Management of type 2 DM is expected to be able to prevent and reduce acute and chronic complications, especially by applying self care behavior. Diabetes Self Management Education (DSME) can facilitate patients in terms of knowledge, skills, and ability to prevent further complications. Aims : Knowing the effectiveness of DSME on Behavior Self Care for Type 2 DM patients Methodology : The design of the study will be conducted using quasi-experimental with a non-equivalent control group design. In this design, the intervention group and the control group were pretest (O1) and followed by giving DSME 4 sessions (X) in the intervention group. After 5 weeks posttest (O2) was performed in both groups. The sample to be used is a non probability sampling study with a purposive sampling method to determine the research subjects. Based on the calculation of the sample formula, the number of samples used in this study were 27 respondents for the intervention group and 27 respondents for the control group.

Keywords
Keywords : Type 2 Diabetes Mellitus, Diabetes Self Management Education, Self Care Behavior

Topic
International Conference on Nursing

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


Effect of fasting on Mondays and Thursdays Towards Total Cholesterol Patients with Type 2 Diabetes Mellitus
Dian Putranto (a*), Yanuar Primanda (b)

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Corresponding Author
DIAN PUTRANTO

Institutions
a) Students of The Masters Program of Nursing, Universitas Muhammadiyah Yogyakarta
*dianputranto03[at]gmail.com
b) Lecturer of Nursing Study Program, Faculty of Medicine and Health Sciences, Universitas Muhammadiyah Yogyakarta

Abstract
Introduction: The patients with type 2 Diabetes Mellitus who did not control their total cholesterol level properly ran the risk of various complications. Diet plan was important to prevent complications of the patients with Type 2 Diabetes Mellitus caused by hypercholesterolemia. Fasting on Mondays and Thursdays was appropriate with Sunnah of Prophet Muhammad SAW and potential for reducing the total cholesterol level of the patients with Type 2 Diabetes Mellitus. Method: This study used Quasy Experimental with pre test and post test control group design. This study was conducted on January to May 2016 in Kasihan, Bantul, Yogyakarta. The respondents consisted of 15 people in experimental group who were given intervention fasting every Monday and Thursday for one month with total sampling technique and 15 people in control group with standard treatment. The data was analyzed using Wilcoxon test and Independent T Test with significance p less than 0,05. Results: The average of cholesterol level after intervention was 189,87 reduce 21,52 in the experimental group and 223,33 reduce 45,77 in the control group. There were significant differences in the total cholesterol level between experimental and control groups before and after having fasting on Mondays and Thursdays and it showed that the total cholesterol level of experimental group was lower than control group, p result is 0,033. Discussion: Fasting on Mondays and Thursdays effectively reduced the total cholesterol level of the patients with Type 2 Diabetes Mellitus. Nurses could suggest the Diabetes Mellitus patients having fasting on Mondays and Thursdays with guidance ahead.

Keywords
Fasting on Mondays and Thursdays, Total Cholesterol Level, Type 2 Diabetes Mellitus

Topic
International Conference on Nursing

Link: https://ifory.id/abstract/Pfurd3LRYTme


Effect of Fin Addition Against Efficiency of Air Heating Solar Collectors V-corrugated plate
Marsianus M.F. Hanmina (a*), Mohamad Hakam (b), Djatmiko Ichsani (b)

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Corresponding Author
MARSIANUS MARIO FREDIRIKUS HANMINA

Institutions
Department of Mechanical Engineering, Institut Teknologi Sepuluh Nopember, Indonesia.
*masryhanmina29[at]gmail.com

Abstract
The availability of fossil energy sources is increasingly limit because of uncontrolled use, so alternative energy to substitute a fossil energy, one of them is solar energy. Solar energy used as a heater or drier, as a solar air collector. Solar air collector is one of the heat exchangers that converts solar energy into heat energy. The performance of the solar heater air collector can improved in several ways, namely changing the shape of flat plate to v-corrugated absorber and adding fin to expand the heat absorption area and adding an obstacle to creating turbulence. Fin which used is a half cylinder with a diameter of 6 mm and the angle of 67.5o towards the direction of the working fluid flow under the absorber plate. The obstacle that used as a working fluid disruptor to obtain turbulence flow by giving a straight triangle bent 30o. The highest Qusefull experimental results on the v-corrugated absorber plate with a mass flow rate of 0.08 kg/s with a radiation intensity of 876 Watt/m2 which is equal to 785.80 Watt. The highest efficiency at the radiation intensity of 654 Watt/m2 with a mass flow rate of 0.06 kg/s which is equal to 87%.

Keywords
V-Corrugated absorber plate; Fin; Efficiency solar collector; Radition intensity; Obstacles

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/bUamg2kQuVhB


EFFECT OF FINANCIAL PERFORMANCE AND MACROECONOMIC CONDITIONS ON STOCK RETURN LQ45
Novita Rizky Sukrianingrum (*a), Isrochmani Murtaqi (b)

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Corresponding Author
Novita Rizky Sukrianingrum

Institutions
School of Business and Management
Institut Teknologi Bandung
novita.sukrianingrum[at]sbm-itb.ac.id
nani[at]sbm-itb.ac.id

Abstract
The LQ45 category is one of the indexes that investors are interested in because it has high liquidity and large market capitalization. However, based on the LQ45 index in the past five years (2013-2017), in 2015 the LQ45 index significantly decreased. It indicates the LQ45 index does not always provide positive returns for the investors. The purpose of this study is to examine the effect of financial performance and macroeconomic conditions on the companys stock returns recorded in the LQ45 index. This study uses 38 samples listed in the LQ45 index for the period 2013-2017, selected using the purposive sampling method. Multiple linear regression is used to determine the relationship between financial performance components: Return on Assets (ROA), Current Ratio (CR), Debt to Assets Ratio (DAR), and macroeconomic conditions: BI Rate, Inflation, Gross Domestic Product Growth (GDP Growth), with stock returns. The result of this study indicates that ROA and GDP Growth have a positive and significant effect on stock returns. CR, BI rate, and inflation have a negative and significant effect on stock returns. DAR has a negative effect on stock returns, but statistically, the effect is not significant. And simultaneously, ROA, CR, DAR, BI Rate, Inflation, and GDP Growth have a negative and significant impact on LQ45 company stock returns.

Keywords
financial performance; macroeconomic conditions; stock returns; LQ45

Topic
International Conference of Islamic Economic and Financial Inclusion

Link: https://ifory.id/abstract/VE9TDH7y6vXQ


EFFECT OF KERSEN LEAF (MUNTINGIA CALABURA L.) ETHANOL EXTRACT AS ANTIHYPERLIPIDEMI ON HYPERLIPIDEMIA RAT MODELS
Imaniar Ranti (a*), Nur Vickasari (b), Sukma Maharani Pangestika (b), Desti Aryani (b)

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Corresponding Author
Imaniar Ranti

Institutions
a) Departement of Pharmacology, Faculty of Medicine and Health Science,
Universitas Muhammadiyah Yogyakarta, Yogyakarta, Indonesia
b) Undergraduate programme of Medical Science, Faculty of Medicine and Health Science, Universitas Muhammadiyah Yogyakarta, Yogyakarta, Indonesia
Email : niarranti[at]gmail.com


Abstract
Hyperlipidemia is one of risk factor that can induce cardiac and vascular disease. Kersen leaf is believed lowering lipid profile because it is consist of flavonoids and tannins. The present study was a laboratorium experimental study with pre and post test control group design. The subjects were 30 male white rats (Rattus norvegicus), body weight approximately 200 grams, aged 3-4 months. Rats model were given high-fat diet and PTU for increasing lipid profile level. Rats divided into 5 groups with random sampling. The groups were negative control was not given any treatment, positive control was given simvastatin treatment, and (P1),(P2),(P3) group was given ethanol extract of kersen leaf 100, 200, and 400 mg/kgBB respectively. This study was held for 4 weeks. Lipid profile level was measured before and after therapy. The results showed that ethanol extract of kersen leaf (Muntingia calabura L.) at dose 400 mg / kgBB optimally can decrease LDL, total cholesterol and triglyceride level and can increase HDL level compared to standard therapy simvastatin. Overall, ethanol extract of kersen leaf (Muntingia calabura L.) is a potential folk medicine as antihyperlipidemi.

Keywords
Ethanol extract of Kersen Leaf, lipid profile, hyperlipidemia rats model

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/8hHRaJfu4exn


EFFECT OF LAVENDER AROMATERAPY GIVING ON DECREASING LEVELS OF ANXIETY IN CONTROL OF OSCE IN STUDENTS LEVEL II NURSING OF UNIVERSITAS MUHAMMADIYAH CIREBON
Rully Annisa (a*), Ima Nurhikmah (b)

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Corresponding Author
RULLY ANNISA

Institutions
a *) Lecturer in Bachelor Nursing Study, Faculty of Health Sciences,
Universitas Muhammadiyah Cirebon
rully[at]umc.ac.id
b) Student of Bachelor Nursing Study, Faculty of Health Sciences,
Universitas Muhammadiyah Cirebon

Abstract
Background: OSCE is a test based on skills (performance) observed when performing various clinical skills that are tested objectively and structurally. And OSCE has a weakness which can arouse feelings of anxiety in students. The causes of anxiety during OSCE are partly due to pressure from the environment, family and students who will take the exam, past experience that has failed in the implementation of the exam and is too afraid if the expected results will not match what is desired, causing anxiety to students. Objective: To analyze the effect of lavender aromatherapy therapy on decreasing anxiety levels in undergoing OSCE in second-level of Bachelor Nursing students,Faculty of Health Sciences, Universitas Muhammadiyah Cirebon. Method: Quasi-experimental design with an approach(pretest-posttest one group Design), with a total sampling technique. The number of samples is 36 respondents. Data collection was done by questionnaire and standard TAI-G scale checklist tool. Technical analysis using the Paired T-test. Results: Paired t Test results show the value of p = 0.014 (where p <0.05) with the value of t count = 2.583 (t count> t table (df 35 = 1.6896) with a positive value (+). Conclusion: Paired t Test test results concluded The provision of lavender aromatherapy was effective in reducing the level of anxiety in undergoing OSCE in second-level of Bachelor Nursing students.

Keywords
Lavender Aromatherapy, Anxiety Level, OSCE , Nursing Students.

Topic
International Conference on Nursing

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


Effect of Meshing Variation on Composite Laminate Material Delamination Simulation with the Cohesive Zone Model Method
Victor Danny Waas (a*), Mas Irfan P. Hidayat (a), Lukman Noerochim (a)

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Corresponding Author
Victor Danny Waas

Institutions
a) Department of Materials and Metallurgical Engineering - Sepuluh Nopember Institute of Technology, Sukolilo, Surabaya 60111, Indonesia

Abstract
Delamination or interlaminar fracture is a model of damage that often occurs in laminate composites. Delamination occurs due to several factors such as high interlaminar stress, stress concentration at the crack location, imperfections when manufacturing and impact stress. Finite element (FE) analysis using cohesive zone model (CZM) is a method commonly used to investigate delamination. In this study, delamination on 3D double cantilever beam (DCB) specimens with mode-I delamination is investigated using interface elements in ANSYS Mechanical APDL software. The element has 8-nodes connecting two surfaces with a bi-linear formulation. Simulations of delamination on carbon fiber composite laminate material T300/977-2 and HTA/6376C are carried out. Effect of number of elements variations on the critical forces of the composite materials is examined. The mesh variations include coarse, fine, and finest meshes. The simulation results show that the critical force values can be obtained accurately using finest mesh. This study also gives a reference number of elements suitable for 3D simulation of delamination in the composite laminates.

Keywords
delamination, cohesive zone model, 3D DCB, T300/977-2, HTA/6376C

Topic
International Symposium of Engineering, Technology, and Health Sciences

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


EFFECT OF OPERATING CONDITIONS ON CURCUMIN EXTRACTED FROM CURCUMA DOMESTICA VALL BY HYDROTHERMAL EXTRACTION PROCESS
Mohammad Endy Yulianto (a), Vita Paramita (a), Rizka Amalia (a*), Indah Hartati (b), Nissa Ayu Maulinda (c), Muhammad Aziz Sulthoni (c)

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Corresponding Author
Rizka Amalia

Institutions
(a) Diploma III of Chemical Engineering, Vocational School Diponegoro University, Semarang Indonesia
(b) Department of Chemical Engineering, Faculty of Engineering, Wahid Hasyim University, Semarang Indonesia
(c) Student of Diploma III Chemical Engineering Vocational School Dipoengoro University, Semarang Indonesia

Abstract
Turmeric (Curcuma domestica Val) has a bioactive compound namely curcuminoid. It has many pharmacology effects such as anticancer, antidiabetic, antioxidant, hypolipidemic, anti-inflammatory, antimicrobial, antifertility, anti-venom, anti-coagulant, anti-HIV hepatoprotective, nephroprotective, and anticoagulant properties. To increase the economic value of Curcuma domestica Val, it is necessary to develop a hydrothermal extraction process of turmerics active compound. The advantages of hydrothermal extraction were inexpensive, abundant availability, high purity, non toxic, and easy to handle. This research aims to study the effect of operating condition : temperature (130-150oC), time (10-40 minutes) and solid:liquid ratio (1:10 and 1:12) on the bioactive compounds of turmeric extracted from hydrothermal extraction process. Generally, high extraction yield was obtained at higher extraction temperature (140 and 150oC). Under these conditions, with a lower solid : liquid ratio (1:10), high concentration of curcumin is produced. Further, a higher solid : liquid ratio will likely produce the opposite result, except when it operate at low extraction temperature. The high temperature of the pressurized liquid water can reduce the viscosity and surface tension of water so it will increase the diffusion rates and absorption. The higher the solid : liquid ratio, the greater the different concentration beetween interior and exterior cell, which promote the high efficiency of the diffusion process.

Keywords
extraction, hydrothermal, Curcuma domestica Val, temperature, solid liquid

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/8nT7gPCczpKQ


EFFECT OF ROSELLE CALYX ETHANOL FRACTION ON ANTIOXIDANT AND CYTOTOXIC TEST USING IN VITRO AND IN SILICO METHOD (On-going research)
B. Innya Untari Afriana (a*), Rifki Ferbriansah (b)

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Corresponding Author
B. Innya Untari Afriana

Institutions
(a*) Department of Pharmacy, Medical Faculty and Health Science,
Muhammadiyah University of Yogyakarta
Jalan Brawijaya, Tamantirto, Kasihan, Bantul, Yogyakarta 55183
*innyauntari[at]gmail.com
(b) Department of Pharmacy, Medical Faculty and Health Science,
Muhammadiyah University of Yogyakarta
Jalan Brawijaya, Tamantirto, Kasihan, Bantul, Yogyakarta 55183

Abstract
The incidence of colon cancer in Indonesia reaches 12.8 per 100,000 adults and 9.5 deaths from all cancers. In the other side, colon cancer treatment has many side effects. Therefore it needs to develop colon cancer drugs combined with natural ingredients as co-chemotherapy to increase efficacy and reduce the side effects. One of them is roselle calyx (Hibiscus Sabdariffa L.) which contains the cyanidin-3-sambubioside (flavonoids) and derivatives which are thought to have the ability to inhibit the growth of cancer cells. This study aims to know activity of Rosella CalyxsEthanol Fraction (FEBR) based antioxidant, cytotoxic and molecular docking. The method used are antioxidant study, cytotoxic study with MTT Assay method and in silico study with molecular docking Autodock Vina method. Antioxidant activity of FEBR showed with IC50 value was 428 ug/ml. Cytotoxic potential of FEBR measured against WiDr cell line with IC50 value was 3483 ug/ml. The ability of cyanidin-3-sambubiosida to inhibit IKK and VEGF target proteins with affinity energy was -9.6 kcal / mol and -6.7 kcal / mol using docking molecular with Autodock Vina. Based on the results can be concluded that sianidin-3-sambubioside in FEBR is less potential to be developed as co-chemopreventive in colon cancer.

Keywords
Hibiscus Sabdariffa L., colon cancer WiDr, antioxidant, cytotoxic, molecular docking, in vitro, in silico

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/PfpA93bjTxvM


Effect of Shape Modification on I-Girder and Box Girder of Prestressed Concrete to Stress and Displacement
Hakas Prayuda, Taufiq Ilham Maulana, Arief Hidayat, Kori Anggraini

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Corresponding Author
Taufiq Ilham Maulana

Institutions
Department of Civil Engineering, Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, Brawijaya Street, Bantul, Yogyakarta, 55183, Indonesia

Abstract
Prestressed concrete has been widely used in structural buildings, especially for big span length purposes. The prestressed concrete dimension cross sections normally are fixed, provided by the factory based on their experience for every span length. However, this size aspect can be developed to make better improvement. In this study, I and box girder shapes were modified with the same total cross sectional area. Three types of modification have been made for each girder shape by giving the space on the middle for I girder and changing form from trapezoidal to rectangular section for box girder. The number of steel tendons for this research was made typically and same so that the stress and displacement can be compared fairly. Manual calculation was performed for all samples and was completed under three circumstances namely initial condition, loading condition, and final condition. Also, the manual calculation is according to Indonesian provisions, which are SNI 2833 2016 for the earthquake load and SNI 1725 2016 for normal loading on bridges. From the result, it is known that one modified shape for each girder shape has met the criteria for the smallest stress and displacement.

Keywords
prestressed concrete, shape modification, stress and displacement, i girder, box girder

Topic
International Symposium of Civil, Environmental, and Infrastructure Engineering

Link: https://ifory.id/abstract/VXwxzqpZtn8b


Effect of Spiritual Emotional Freedom Technique (SEFT) Therapy on Game Addiction Test Scores among University Students in Yogyakarta Indonesia: A Pilot Study
Oryzati Hilman, Indra Maulana

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Corresponding Author
Amanda Amanda

Institutions
Universitas Muhammadiyah Yogyakarta, Indonesia

Abstract
Background: Online game addiction or internet gaming disorder is becoming a serious concern worldwide. The World Health Association (WHO) has classified gaming disorder as a mental health condition, characterized by impaired control over gaming, harmful to an individuals well-being. Cognitive-behavioral therapy (CBT) is a usual therapy for the disorder. Spiritual Emotional Freedom Technique (Spiritual-EFT/ SEFT) therapy, utilizing one-s body meridian points similar to acupuncture, using fingers instead of needles, is recently introduced to treat the disorder. Objective: The pilot study examined the effect of SEFT therapy on gaming disorder. Methods: This was a two-group pretest-posttest quasi-experimental design using a stratified random sampling. Gamers at a private medical school in Yogyakarta, Indonesia, were screened with a previously validated game addiction test. Twenty medical students who met criteria for game addiction were recruited and assigned to intervention and control groups, each consisting of 10 participants. The intervention group received one session of 15-45 minute SEFT therapy conducted by SEFT therapists. Data collected was analyzed using paired t-test and independent t-test. Results: Mean pretest and posttest game addiction test scores in control group were 47.40 and 46.00 respectively, in intervention group were 44.70 and 33.60 respectively. Paired t- test analysis of the scores before and after SEFT therapy in intervention group showed p=0.009 (p<0.05), in control group showed p=0.252 (p>0.05). Independent t-test analysis measuring score changes between both groups showed p=0.007 (p<0.05). Conclusion: SEFT therapy has potentials in reducing game addiction test scores among university student gamers. The findings support testing with a larger sample.

Keywords
Spiritual Emotional Freedom Technique (Spiritual-EFT/ SEFT), online game addiction, internet gaming disorder, game addiction test

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/UhbcXHvM3na8


Effect of Time and Temperature of Storage on Protein Levels in Breast Milk: Systematic Review
Irmastuti Lukitaning Alam

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Corresponding Author
Irmastuti Lukitaning Alam

Institutions
Program Pascasarjana Poltekkes Kemenkes Semarang
Jl. Tirtoagung, Pedalangan, Banyumanik, Semarang
Tlp. 024 - 7460274

Abstract
Background: Breast milk is a quality food for babies because of its nutrient and immunity content. Proteins found in breast milk are needed to form the bodys tissues that are needed starting from the beginning of a babys life. The high percentage of working mothers who breastfeed is directly proportional to the number of babies who consume milk from dairy mothers. Storage of dairy milk at certain times and temperatures is an unavoidable activity. Three differences were obtained from the research that had been carried out, namely that the storage temperature did not affect the protein content of breast milk, reduced the level of breast milk protein and increased the protein content of breast milk. Researchers want to do a systematic review to get relevant results through reputable journal. Objective: To find out the relevant results regarding the effect of time and storage temperature on protein levels of breast milk. Method: Using systematic reviews through journal reviews on the effect of time and storage temperature on protein levels of breast milk. Elsevier and science direct searches are accessed in the range of 2009 to 2019. All journals are from overseas in English. Results: Systematic review showed that protein levels of breast milk did not change significantly with respect to time and temperature of storage, both the storage temperature (refrigerator) and the temperature of pasteurization.

Keywords
time, temperature, storage, protein, breast milk.

Topic
International Symposium of Engineering, Technology, and Health Sciences

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


EFFECT QUENCHING AND VARIATION TEMPERING TEMPERATURE AT 200, 300 CELCIUS TOWARDS CORROSION RATE OF MARTENSITIC STAINLESS STEEL
Sotya Anggoro

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Corresponding Author
Sotya Anggoro

Institutions
Mechanical Engineering, Vocational Program, Universitas Muhammadiyah Yogyakarta

Abstract
This study present the effect heat treatment Quenching and Tempering on martensitic stainless steel material. The heat treatment Quenching is done at 1020 Celcius of temperature within 60 minutes holding time. In this treatment oil SAE 40 is used as cooling media. As for maintaining the toughness of the material, Tempering is applied at 200 and 300 Celcius of temperature within 45 minutes holding time. Then, the material is cooled down using air at temperature room. The results showed the Quenching treatment increases the material hardness by 192 percent compared to the base material. And with the tempering treatment the hardness of the material is slightly decreases, but still above the material without heat treatment. Futhermore, the corrosion rate decreases significantly by 47 percent. Therefore, the heat treatment, Quenching and Tempering, on martensitic stainless steel has greatly reduce the corrosion rate of the material

Keywords
heat treatment; quenching; tempering; corrosion

Topic
International Symposium of Engineering, Technology, and Health Sciences

Link: https://ifory.id/abstract/zEZDtyrJR9mu


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