Indonesia Conference Directory

Corresponding Author
Mochamad Faizal Rizki

Institutions
Government Studies Department, Singaperbangsa University

Abstract
The acceleration of development, population growth and land conversion causes pressure on ecosystems in the northern coastal area of West Java. The ecosystem damage is quite severe experienced by Sedari Village, Cibuaya Subdistrict, which is on the northern coast of Karawang Regency, mangrove forest which is a coastal biodiversity ecosystem and natural fortress from the onslaught of ocean waves (abrasion) is increasingly pressed for its existence. This article aims to analyze and illustrate how the Sedari Village government together with all stakeholders make efforts to implement rehabilitation of mangrove ecosystems to prevent the threat of abrasion through governance innovation that includes new types of leadership, technical and management capabilities, the strength of civil society, space for participation

Keywords
abrasion, mangrove, governance innovation

Topic
Sustainable Development Goals

Link: https://ifory.id/abstract/hjqCXZ3vUAMW

Corresponding Author
Zahratul Idami

Institutions
Department of Government Studies, Faculty of Social and Political Sciences, Universitas Syiah Kuala, Banda Aceh, Indonesia;
*Corresponding author: zahratulidami_isa[at]unsyiah.ac.id and andrian22[at]mhs.unsyiah.ac.id

Abstract
Ethics in Leadership are an evolving and important subject to research in the Islamic political studies. This is because ethics in leadership are one of the foundations that deciding the value of good or bad. Many Muslim scholars who have poured his idea to build the concept of ethics in leadership that gives the benefit and happiness in this world and hereafter. Imam al-Ghazali is one of the scholars who has written works on ethics in leadership. His idea of ethics in leadership is built on a solid foundation and has a typical Sufi moral. His Thoughts on ethics in leadership has become a reference and an important example for many leaders in the world until today. This research is library research with the research is a qualitative descriptive approach. The results showed that the concept of ethics in leadership by Imam al-Ghazali oriented to the impact of the soul in the pursuit of happiness in this world and hereafter. Ethics in the thinking of Imam al-Ghazali described as rational and religious science that should be combined in the leadership. The idea of ethics in leadership was not similar to the dominant secular ethics. The requirement to be a leader according to Imam al-Ghazali is focused on aspects of the character and integrity of a leader. The essence is, ethics in leadership should be the path to apply Gods law in order to create balance in the world toward eternal happiness in the afterlife.

Keywords
Keywords: Ethics, Leadership, Imam al-Ghazali, Political Sciences

Topic
Education and Social Change

Link: https://ifory.id/abstract/BqtQHX37UJ2r

Corresponding Author
Bani Pamungkas

Institutions
Bakrie University and Sultan Ageng Tirtayasa University

Abstract
Abstract—Both in global and local context, cities have become more important politically, economically and socially. With rapid growth of Information and communication technology (ICT) over the last decade, human relations have revolutionized, creating new possibilities of encounter and connectivity, as well the new way for strengthening cities government and citizen relations. The cities government have started to use ICT to foster citizen engagement with broader and deeper contributions in political decision-making process for achieving openness and transparency. Innovative digital and mobile technology facilitate solutions for government to respond demand participation including informing, consulting and engaging citizens during legislation cycle process. However, the development of e-participation in the digital city context still have primary challenge for reaching participation of low-income, older and technology-challenged citizens. This paper tries to elaborates a literature study of conceptual publications on the subject of eParticipation in term of legislation process with the time frame of 2013–2018. Its objectives are to track recent theoretical and practical development in the field, to reveal constraints and limitations the concepts, and to offer some suggestions for city government in Indonesia for developing digital legislation implementation strategy.

Keywords
political participation, cities government, citizen relation, ICT, legislation cycle

Topic
Digital Governance and Citizenship

Link: https://ifory.id/abstract/enAXGFZ8aNwH

Corresponding Author
Dini sri Gustiani

Institutions
a) SMK Bela Nusantara
Jalan Sirnagalih, Cilaku, Kabupaten Cianjur, Jawa Barat 43285 Indonesia
*dini.gustiani02[at]gmail.com
b) SDN Cibulakan
Jalan Gatot Mangkupraja Desa Cibulakan Kecamatan Cugenang Kabupaten Cianjur Jawa Barat, Indonesia
c) SMP Negeri 2 Cilamaya Kulon
Jalan Pulo Putri Desa Sukamulya – Cilamaya Kulon, Karawang, Jawa Barat 41384, Indonesia
*fadhillah_fika[at]yahoo.com

Abstract
The purpose of this study is to examine the achievement and improvement of junior high school students mathematical communication ability using discovery learning models and props of statistical kenik compared to students who use ordinary learning, and student activities during learning using discovery learning models and props of statistical kenik to take place. This study used a quasi-experimental design. The experimental group obtained learning with discovery learning models and props of statistical kenik and control groups obtained regular learning. The instrument used was a test of mathematical communication ability. The population in this study were all eighth grade students of SMP Negeri 2 Cilamaya Kulon Karawang. With the sample subjects were eighth grade students as many as two classes from the five existing classes randomly selected. The results of this study are: (1) There is achievement and improvement of mathematical communication ability between students whose learning uses discovery learning models and props of statistical kenik compared to students who use ordinary learning; (2) Learning by using discovery learning models and visual aids shows that the learning process is more effective in mathematical problems solving and students can find statistical material concepts.

Keywords
Discovery Learning Models, Props Statistical Kenik, Mathematical Communication Ability

Topic
Mathematics Education

Link: https://ifory.id/abstract/UHTnQq2FJKZW

Corresponding Author
Tri Nopriana

Institutions
(a,b) Pendidikan Matematika, Universitas Swadaya Gunung Djati, Jl. Perjuangan No. 01, Cirebon 45131, Indonesia

*trinopriana[at]unswagati.ac.id

Abstract
Good candidates for mathematics teachers are those who have good thinking skills especially in mathematics, good habits of mind and the ability to survive under pressure. Those skills are reflected in the level of geometric thinking, the level of logical thinking, the scale of habits of mind and resilience in mathematics. The purposes of this study were to analyze the achievement of the level of geometric thinking, the level of logical thinking of pre-service mathematics teachers, describe the habits of mind and student resilience in mathematics. The research subjects consisted of 30 mathematics education students at FKIP Swadaya Gunung Djati University (UGJ) as pre-service mathematics teachers who would practice by teaching in schools. The instruments in this study were: (1) van Hieles geometrical thinking test developed by The Cognitive Development and Achievement in the Secondary School Geometry Project (CDASSG), (2) the logical thinking test (TOLT) designed by Tobin and Capie, (3) The Habits of Minds Scale, and (4) Mathematical Resilience Scale with 4 categories of Likert models. The results of the study were that pre-service mathematics teachers achieved: (1) the level of van Hieles geometrical thinking at the stage of informal deduction, (2) the level of logical thinking at the formal thinking stage, meaning pre-service mathematics teachers were able to solve problems related to proportional reasoning, variable reasoning, correlational reasoning, and combinatorial reasoning. Furthermore, on the soft skills, pre-service mathematics teachers have (3) habits of mind in the good category with an average achievement of 74.5%, this is also seen in achievement (4) the resilience in mathematics who have a good category with an average achievement of 73.6%. Based on the results of the study, it can be concluded that overall the pre-service mathematics teachers in FKIP UGJ have good abilities in geometrical and logical thinking, the habits of mind and resilience in facing mathematical problems.

Keywords
van hiele gemetric thinking, logical thinking, habits of mind, resilience in mathematics.

Topic
Mathematics Education

Link: https://ifory.id/abstract/zNZuARqF8xeD

Corresponding Author
Yayan Mulyana

Institutions
IKIP SILIWANGI

Abstract
The cooperative learning model is a teaching strategy that emphasizes attitudes or behaviors in working or helping among others in the structure of regular cooperation in groups, consisting of two or more people. The problem in this study is whether the application of the STAD cooperative learning model influences students mathematics learning achievement. This study uses the experimental method, using the experimental group of the STAD type cooperative learning model while the control group uses conventional/ordinary learning models. The population in this study was all students of SMA 1 Cibatu class 1, while the samples were two randomly selected classes from 6 existing classes. The instrument is used in this study is a set of description type test questions. To test the hypothesis, the Mann-Whitney test is used and from the test results it is obtained that Zhitung is -3.47 and Ztabel is 2.575 with α = 1%. It turns out that with the -Ztabel < Zhitung < Ztabel H0 is in the rejection area, it means that there is a significant difference in final ability between the experimental group and the control group. So it can be concluded that there is the influence of the STAD cooperative learning model on students mathematics learning achievement.

Keywords
COOPERATIVE LEARNING MODEL TYPE OF STUDENTS TEAMS ACHIEVEMENT DIVISIONS (STAD),LEARNING ACHIEVEMENTS

Topic
Mathematics Education

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

Corresponding Author
Wahyu Hidayat

Institutions
Institut Keguruan dan Ilmu Pendidikan Siliwangi
Jalan Terusan Jenderal Sudirman, Cimahi 40532 Indonesia
*venytriyana050113[at]gmail.com

Abstract
The purpose of the study is to examine whether or not there is an increase in students critical and creative thinking skills using DLPS learning compared to ordinary learning. The method of this research is a quantitative method, with a pretest-posttest design. The population of this study involved all class VIII students in one of the Cimahi Junior High Schools, while the sample selected by two classes VIII consisted of the experimental class namely students who received DLPS learning and control classes namely students who received ordinary learning. The technique of processing N-gain scores using IBM-24 SPSS software. The results of this study are 1) increasing the ability of mathematical creative thinking of students who use DLPS learning better than students who use ordinary learning and 2) increasing the ability of mathematical critical thinking students who use DLPS learning is no better than students who use ordinary learning. In general it can be concluded that DLPS learning can improve students creative mathematical thinking skills but have not been able to improve students mathematical critical thinking skills, especially in junior high school.

Keywords
Creative Thinking; Critical Thinking; Double-Loop Problem Solving

Topic
Mathematics Education

Link: https://ifory.id/abstract/NWHaEy4vMzTn

Corresponding Author
Wahyu Hidayat

Institutions
Institut Keguruan dan Ilmu Pendidikan Siliwangi
Jl. Terusan Jenderal Sudirman, Cimahi, Indonesia
* wahyu[at]ikipsiliwangi.ac.id

Abstract
The Mathematical understanding has been studied before, but no research has a focus on mathematical understanding and adversity quotient (AQ) of the pre-service mathematics teacher. This study is experimental research that aims to know about the influence of AQ of pre-service mathematics teacher toward the achievement of mathematical understanding ability. The population of this study is the pre-service mathematics teacher in Cimahi City, West Java, Indonesia; while the sample is 55 pre-service mathematics teachers selected purposively. The results show that: (1) AQ gives positive influence to the development of mathematical understanding ability of pre-service mathematics teacher with the influence of 57.3%, while the rest of it (42.7%) is influenced by other factors outside AQ; (2) there are differences in achievement in mathematical understanding ability of pre-service mathematics teacher based on AQ level (climber, camper, quitter).

Keywords
Adversity quotient; Mathematics understanding;

Topic
Mathematics Education

Link: https://ifory.id/abstract/TGKYrp48Nzt6

Corresponding Author
IDHA NOVIANTI

Institutions
a) UT
b) UPI

Abstract
The selection of the right learning model can improve student achievement. This study aims to determine the effect of using Quantum Teaching learning models on students comprehension abilities. The research sample was 7th-semester students who took elementary mathematics learning courses in the Tangerang district study group randomly selected as many as two classes, the first class as the experimental class, namely the class with the Quantum Teaching learning model and the second class as the Control class, namely the classroom with conventional learning. The instruments used were 1) pretest-posttest, and 2) observation sheet. Data is processed with SPSS. The result is a class with a Quantum Teaching learning model that shows better understanding skills than the control class, sig-value (2-tailed) (0.016) <α=(0.025), ie there is a difference in comprehension ability between classes with Quantum Teaching learning models with ordinary learning classes , from the table of statistical groups it is known that the mean value of the class with the Quantum Teaching learning model (85.0) is greater than the average class average (62.0), and the average N-gain class value with the Quantum Teaching learning model has a high increase (0.81), while the ordinary N-gain class has a moderate increase (0.5), so the Quantum Teaching learning model can improve students comprehension abilities, and students appear to be more confident because in this learning model there are many interactions that maximize the learning process.

Keywords
Mathematical Understanding Ability, Quantum Teaching-Learning Model, FKIP students

Topic
Mathematics Education

Link: https://ifory.id/abstract/q3ef4Pb78rmV

Corresponding Author
Iwan Fajar Pahlawan

Institutions
Center for Leather, Rubber and Plastics, Ministry of Industry

Abstract
The study aimed to investigate the influence of flame retardant addition in fatliquoring and finishing process on the quality of the finished leather. The research used materials, i.e. pickled cattle hides, chromium basic sulphate, synthetic tanning agents, commercial flame retardant, fatliquors, dyestuff, and other chemicals for beam house operation and finishing process. The trial included the addition of flame retardant in fatliquoring (2%, 4%, and 6% w/w) and finishing process (100 parts, 200 parts, 300 parts). As a control, pickled cattle hides were processed without the addition of the flame retardant. The evaluation of the samples was emphasized on the physical and mechanical properties of those after the treatment. Physical properties were represented by the shrinkage percentage, thickness, and rub fastness. While, mechanical properties comprised the tensile strength and elongation at break. The results showed that the resultant leather-s shrinkage percentage varied from 7.65% to 13.03%, the thickness covered a range between 0.71 mm to 1.01 mm, and the rub fastness was 5 (dry basis) and 4/5 (wet basis). This study concluded that several treatments could meet the standard related to leather working gloves and heat resistance leather.

Keywords
Fatliquoring, finishing process, flame retardant, heat resistance leather, leather working gloves

Topic
Post harvest handling and processing of meat, milk, eggs, wools, and by-products

Link: https://ifory.id/abstract/KNdjvCH4LMUt

Corresponding Author
Adi Firman Ramadhan

Institutions
Universitas Diponegoro

Abstract
Interaction between various internal and external corporate governance mechanism in reducing earning management must be analyzed deeply. Based on this case, this study aims to analyze the effect of the effective audit committee and the interaction between the audit committee with the qualified external auditor in reducing earning management. Audit committee is measured by forming a score from the number of members formed an audit committee and the number of audit committee-s meetings in one year, while audit quality from external auditor is measured based on the auditor-s industry specialization, auditor-s reputation and audit tenure. The sample of this study was obtained through purposive sampling method so that 93 samples of non-financial company in Indonesia was obtained. A linear-multiple regression analysis was used to test the hypothesis of this study. The result of this study indicate that the audit committee has a negative effect on earning management, the interaction between the audit committee and industry specialist auditor has no effect on earning management, the interaction between the audit committee and Big Four auditor has a negative effect on earning management and the interaction between the audit committee and auditor tenure has no effect on earning management.

Keywords
audit committee, audit quality, earning management, purposive sampling

Topic
Accounting

Link: https://ifory.id/abstract/cpbekXY8JNvw

Corresponding Author
Lendi ageng Kurnia

Institutions
Economics and bussines faculty , Diponegoro University

Abstract
The priority of the Nawacita Program in the agricultural sector is to increase superior production, especially rice. In achieving these objectives, it is necessary to ensure the availability of national rice. The availability of national rice is fulfilled from 3 aspects, namely local rice production, government rice reserves and rice imports. Most of the previous research, the availability of rice only accounted for local rice production and rice imports. In this study, the governments rice reserves are counted as one of the main indicators. Because local rice production used to meet peoples needs is always reduced in volume to meet the governments rice reserves. In achieving rice self-sufficiency, this study also observed how the ability of local rice production to be the only one to supply the availability of national rice, without bringing in from outside parties. Research using the LS method with the Minitab 15.1 program shows the results that partially the availability of national rice is positively influenced by indicators, namely local rice production and rice imports while the governments rice reserves negatively influence. Forecasting the ability of self-sufficiency in rice by relying on local production in supplying the availability of national rice in the future, shows a positive trend meaning the value of the trend of forecasting increases with increasing time. The factors that influence the achievement of rice self-sufficiency are partially determined by rice supply, rice productivity, the gap in rice prices to grain prices, and the use of balanced fertilizers. But it is not influenced by the level of rice consumption in the community. With the results of this study, the availability of national rice is still very dependent on local and foreign rice products. However, to achieve rice self-sufficiency in the future, where all needs are met from local products is not impossible, so that dependence on imported rice can be reduced.

Keywords
availability of rice, self-sufficiency in rice, production

Topic
Economics

Link: https://ifory.id/abstract/kUCXuqpxD2Fe

Corresponding Author
jamal radifan

Institutions
Magister Of Management, Faculty of Economy and Business, Universitas Indonesia

Abstract
Currently, the type of industry that still growing is the wedding industry. The increasing number of marriages in Indonesia contributes to the need for wedding services. MSME X owners seek the opportunities needed to provide services and various options for the needs of marriage. MSME X is currently held in Jakarta and Bekasi. This study discusses the business coaching process report MSME X personal selling and improving promotional materials in the form of brochures to attract consumers. The preliminary analysis shows that marketing employees use brochures as sales aids, related to the level of sales competency among marketing employees, personal selling activities are not optimal, thus affecting the companys sales targets. Primary data collected through in depth interviews and observations, while secondary data is obtained from owners, the internet, and management books. The collected data will be analyzed using qualitative and quantitative methods. This study discusses the improvement of promotional materials and the preparation of personal selling standards as a marketing promotion tool for the sale of wedding services from the standards that have been prepared through the implementation of business coaching programs. The results of this study can help MSMEs overcome the difficulties of employees in conducting personal selling activities.

Keywords
MSME; Personal Selling; Promotional Material; Wedding Industry

Topic
Management

Link: https://ifory.id/abstract/tNW6Ydhq9zgE

Corresponding Author
NURBARIRAH AHMAD

Institutions
UNIVERSITI TEKNOLOGI MARA, MELAKA BRANCH, MALAYSIA

Abstract
This study was conducted to explain the impact of office layouts on employee-s productivity. The subject area for this study was in Amanah Saham Pahang Berhad (ASPA). The researcher decided to use open plan office and enclosed plan office as the factors that influence employee-s productivity as the result to the employees in Amanah Saham Pahang Berhad (ASPA). This study involves 52 respondents from Administration Department, Finance Department, Logging, Planning and development of Forest Department and Investment Department. The 52 structural questionnaires then have been used to collect data from the respondents and the all the 52 respondents completed answer the questionnaire. Besides that, a set of questionnaires will be distributed to respondents and the information will be collected as part of the sources of data for this research study. The results indicate from the findings shows that only enclosed plan office have significant positive relationships and it answered research questions as well as support the hypotheses presented in this research study. As a conclusion, this research study helps the other researcher to explore the impact of office layout on employee-s productivity. This research study result supported by previous results that presented at every research finding.

Keywords
Office Layout, Open Plan Office, Enclosed Plan Office, Employee Productivity

Topic
Management

Link: https://ifory.id/abstract/xuJXAfc7FLkC

Corresponding Author
Fabian Danandjaya Puspadewa

Institutions
Universitas Indonesia

Abstract
The increasing number of MSMEs (Micro, Small and Medium Enterprises) in Indonesia has had a positive contribution to Indonesias economy, but many MSMEs unable to manage their business well. PT Selula Dwiphaloka Technologi is an MSME that sells a custom-design machine for B2B customer and in the preliminary analysis found that MSME couldn-t manage their marketing activities well. The data were collected using business coaching methods, a qualitative research that used to mapping MSME-s condition and problem, then take a corrective action to implement solutions for improvement. The result shows that the MSME need to develop SOP of personal selling, improve the company profile proposal, and improve the websites to support marketing activities. Surveys were also conducted to support evidence of the improvement result. This study aims to help PT Selula Dwiphaloka Teknologi manage their marketing activities by creating SOP of personal selling, designing new company profile proposal and website.

Keywords
marketing, MSME, personal selling, B2B, promotional tools

Topic
Management

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

Corresponding Author
ARIS SETIYANI

Institutions
Mercu Buana University

Abstract
The environment in the world of work is currently influenced by the large number of millennials that are beginning to arrive. This millennial generation has behavior that is different from the previous generation. The generation that likes freedom, and is very familiar with this technology is difficult to predict whether he will feel at home in the company or he will quickly move to find a company he likes. The purpose of this research is to see the effect of compensation, communication and employer branding on employee engagement. In this study the author also wants to find out the effects of the three on increasing employee motivation. and whether the employees motivation has a mediator effect between the three variables with employee engagement. Respondents in this study were the generation of millennial Y with a total of 285 samples taken from most of the islands of Java in Indonesia.The results of this study found that compensation, communication dan employer branding have an influence on both employee motivation and employee engagement. Motivation of employees can also function as a mediator of all three variables towards employee engagement. The results of this study, will be very useful for human resource management in making a strategy to deal with millennials who began arriving in the workforce. These results recommend a priority scale that must be developed so that it can maintain the millennial generation. It is hoped that with retain, the generation will be better involved in achieving organizational goals. A strong organization, with a millennial generation team that engages with the company will make the organization win a sustainable business

Keywords
Sustainability Business; Compensations; Communications; Employer Branding; Employee Motivation; Employee Engagement; Millenials Generations; SEM; AMOS

Topic
Human Resource Management

Link: https://ifory.id/abstract/3DLwCJHU9Ekm

Corresponding Author
Mochammad Fahlevi

Institutions
School of Business Kusuma Negara, Jakarta, Indonesia
fahlevi[at]stie-kusumanegara.ac.id

Abstract
This study discusses the results of empirical research that examines the impact of representation of female CEOs in directors and CEO (CEO tenure) tenure on earnings management in companies listed on the Indonesia Stock Exchange (IDX) for the fiscal year ending 31 December 2014 to 2016 The results of the research regression analysis support the one hypothesis which states the representation of female CEOs has a negative effect on earnings management. The longer term of office of the CEO negatively affects earnings management. The results of the research regression analysis support the second hypothesis which states CEO tenure has a negative effect on earnings management. The robustness test results are significantly negative for earnings management

Keywords
woman, ceo, tenure, earning management

Topic
Accounting and Financial Management

Link: https://ifory.id/abstract/2YT36xUzPJV7

Corresponding Author
Arif Prasetio

Institutions
TELKOM University

Abstract
The present study was aimed to examine the relationship between perceived organizational support and turnover intention among employees in private sector. The study also focused work stress as mediator in the relation. The participants of this study were employees in consultant and garment industry. Data was collected throught human resources manager and we have 215 useable responses. Results of the study revealed that employee perceived that there was strong organizational support. They also experience low level of turnover intention. Emplyoyees experience medium to low level of work stress. Process Macro with SPSS was used to identify the relation between variables and also to examine whether there is a mediation or not. Current study using cross-sectional approach to highlight the existence of relationships between variables. It was found that perceived organizational support has significant negative effect on work stress and turnover intention. While work stress has positive effect on turnover intention. The study also proved that work stress played a mediation role on the relationship between perceived suport and turnover intention. It is important for organization to provide adequate support for employees so they will experience less stress and will stay longer.

Keywords
perceived organizational support, work stress, turnover intenion.

Topic
Organizational Behavior, Leadership and Human Resources Management

Link: https://ifory.id/abstract/QAKLj6pBhTY9

Corresponding Author
Arya Wedha Rieantiari

Institutions
a) Magister Akuntansi, Faculty of Economic and Business, Universitas Indonesia
raryawedha[at]gmail.com

b) Faculty of Economic and Business, Universitas Indonesia
ancella.anitawati[at]ui.ac.id

Abstract
This study aims to detect indications of bond defaults by conducting a thorough analysis from published financial statement. Published financial statement of the firm have roles to give value added information for investors and creditors in making investment decision. Those roles can be failed when management do creative accounting to mislead users of the financial statement. PT Trikomsel Oke, Tbk (TRIO)s financial statements show that the companys revenue and profits increased during 2009-2014. However, the Indonesia rating agency (PEFINDO) declared default on both bonds issued by TRIO in November 2015, even though the signal TRIO gave to its financial statements was an unqualified opinion from one of the big four Public Accountants (KAP) for six consecutive years, and got PEFINDOs investment grade. The financial statement is analyzed with financial ratio and financial shenanigans indicators. Evidences show that there are some red flags of creative accounting and shenanigans action before the bonds declared a default in 2015. The profitability ratio that is not in line with cash flow from operation is the main concern of shenanigans indicators and also the highlight from all respondents. This result suggests investors and creditors to be more vigilant in analyzing the published annual report

Keywords
shenanigan indicators; financial statement analysis; bond defaults.

Topic
Financial Management and Accounting

Link: https://ifory.id/abstract/3CHUKmgeDBM7

Corresponding Author
AGUS SOLEHUDIN

Institutions
Departemen Pendidikan Teknik Mesin, Fakultas Pendidikan Teknologi dan Kejuruan, Universitas Pendidikan Indonesia
Jl. Dr. Setiabudhi No. 229 Bandung 40154

Abstract
Boiler merupakan salah satu unit penting dalam dunia industri, termasuk di Pembangkit Listrik Tenaga Uap (PLTU). Kinerja, efisiensi dan umur pakai boiler perlu diperhatikan untuk menghindari potensi kerusakan sehingga dapat meminimalisir potensi kecelakaan kerja. Kerusakan pada boiler umumnya terjadi pada pipa seperti pipa water wall, superheater dan header. Salah satu penyebab kerusakan boiler adalah korosi yang disebabkan oleh oksigen dan karbon dioksida dalam uap yang terkondensasi serta ion-ion korosif yang terkandung dalam air umpan yang masuk melalui pipa-pipa tersebut. Jenis korosi yang menyerang pipa-pipa boiler diantaranya korosi seragam, korosi sumuran dan korosi erosi. Pengendalian korosi tersebut dilakukan dengan penggunaan inhibitor korosi. Saat ini telah dikembangkan jenis inhibitor korosi dari senyawa organik berbahan alam yang mudah diperoleh, ramah lingkungan dan bersifat biodegradable. Dalam penelitian ini, digunakan ekstrak getah Pinus merkusii sebagai inhibitor korosi organik yang mengandung senyawa α-pinena. Penelitian ini dilakukan untuk mengetahui efektivitas ekstrak getah Pinus merkusii dalam menghambat laju korosi material pipa air boiler. Penelitian eksperimen ini meliputi proses ekstraksi getah Pinus merkusii, pengujian komposisi kimia spesimen pipa air boiler, dan pengujian laju korosi spesimen pipa air boiler dengan metode uji kehilangan berat pada tiga variasi lingkungan korosif (HCl, H2CO3 dan NaCl) dengan variasi konsentrasi inhibitor sebesar 250 ppm dan 500 ppm, dalam waktu pengujian selama 7 hari. Berdasarkan hasil pengujian, spesimen material pipa air boiler teridentifikasi sebagai baja paduan standar ASTM A213/A grade T91, dan ekstrak getah Pinus merkusii terbukti efektif mampu menghambat laju korosi spesimen pada ketiga lingkungan korosif berbeda dengan nilai efisiensi inhibisi rata-rata mencapai 60%.

Keywords
Boiler, pipa air, standar ASTM A213, inhibitor korosi, Pinus merkusii

Topic
Material

Link: https://ifory.id/abstract/4QBrj6KfcePp

Corresponding Author
Deok-Yong Cho

Institutions
Department of Physics, Chonbuk National University

Abstract
X-ray absorption spectroscopy (XAS) is an easy and nice method to examine the chemical and local structural properties of materials which measures the X-ray absorption coefficients with various incident X-ray energies. XAS can reveal the atomic coordination and the intersite or intrasite electron-electron interactions for each atomic species, so that it can be commonly employed for identifying the local electronic structures of condensed matter. In this talk, I would like to overview the general principles of XAS for the local structural identification, and showcase some examples of theoretical considerations for metal oxide systems including manganites, double perovskite cobaltites and hafnia-zirconia. For the simulation of soft XAS spectra, the concept of configuration interactions with atomic multiplets is employed. For the simulation of hard XAS spectra (so-called XANES), the ab-initio real space multiplet scattering calculation (FEFF) is employed.

Keywords
X-ray absorption spectroscopy, XANES, FEFF, Configuration interactions, Atomic multiplets

Topic
DV-Xa Method

Link: https://ifory.id/abstract/Q4vLh6PgRGXK

Corresponding Author
Lungid Wicaksana

Institutions
Masters in Public Administration, Sebelas Maret University Surakarta, Jl. Ir. Sutami No.36 A, Pucangsawit, Kec. Jebres, Surakarta City, Jawa Tengah, Indonesia

Abstract
One of the major changes that have taken place in the field of Indonesian railroad transportation has changed various aspects such as policy, organization, managerial, service and travel systems, and infrastructure. A very significant change was shown in financial terms that experienced a large surge. The problem focusing on equity, development and infrastructure integration only focuses on Java and a few in Sumatra island. Later, in this study provides a view of how sustainable transportation reforms are seen from the stages and factors that influence the classification of countries based on material welfare. Where developing countries and developed countries apply different systems and methods according to the recommended model. Then it will be known which systems and methods are suitable to be applied based on the problems that occur through the glasses of partnership with the aim of resolving government issues related to financial and non-financial issues with the private sector.

Keywords
Sustainable, Transportation, Reformation, Partnership

Topic
Public Policy, Public Service and Sustainable Development

Link: https://ifory.id/abstract/2vHu8QhgTGtn

Corresponding Author
David Kaluge

Institutions
Faculty of Economics and Business, Brawijaya University, Malang, Indonesia

Abstract
Standard theory of inflation is based on supply side and demand side theories. Both sides are about economic variables works which are simultaneously create the level of inflation in a region or district. All economies realize that all economic variables work not in an abstract space but in a real space in a physical space. Unfortunately very view studies and theories have been developed in the spatial impact. An important question is why the same monetary policy has different impact on different regions even though they have relatively same basic economic condition? This study aims at finding the question of how economic spatial have a significant role in inflation among districts in the province of East Java. By applying Spatial regression and Moran I to investigate if here is a spatial dependency among districts and also spatial interaction among them, it will identified if inflation rate among districts is also affected by spatial dimension. This study found that spatial dimension has a significant role in price stability in the region, but to choose the right spatial weight for the regression is crucial. Based on the result, the change in infrastructure has impact on transport cost and eventually on inflation rate. Policy maker have to analysis and decide properly which part of road or other spatial related facilities to be developed in order to have maximum impact to control inflation in the region.

Keywords
spatial inflation; spatial correlation; spatial regression; spatial weight matrix; impact of Tol; spatial dependency

Topic
Sosical Economic and Community Development

Link: https://ifory.id/abstract/EkgF8xyZnc6L

Corresponding Author
Rahmat Putra Ahmad Hasibuan

Institutions
(a) State University of Medan
Economics Major Student, Master Degree Program

(b) State University of Medan
Lecturer in Faculty of Economics

(c) State University of Medan
Lecturer in Faculty of Economics

Abstract
The objective of this study is to measure the efficiency rates of Sharia banks in Indonesia and know the determinant of such efficiency. The data are obtained by applying the library study, where internet sites are browsed followed by document analysis with the secondary sources from Indonesian bank sites, OJK, and financial statements of Sharia banks. The data are processed by applying DEA analysis dan data panel regression. The finding indicate that Sharia banks in Indonesia has not been fully efficient and NPF variable, Bopo negatively affect the efficiency of Sharia banks, while size, FDR and car positively affect

Keywords
Efficiency Rates, Determinant Efficiency, DEA, Data Panel Regression

Topic
Economics, Business and Management Education

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

Corresponding Author
Lungid Wicaksana

Institutions
Masters in Public Administration, Sebelas Maret University Surakarta, Jl. Ir. Sutami No.36 A, Pucangsawit, Kec. Jebres, Surakarta City, Jawa Tengah, Indonesia

Abstract
One of the major changes that have taken place in the field of Indonesian railroad transportation has changed various aspects such as policy, organization, managerial, service and travel systems, and infrastructure. A very significant change was shown in financial terms that experienced a large surge. The problem focusing on equity, development and infrastructure integration only focuses on Java and a few in Sumatra island. Later, in this study provides a view of how sustainable transportation reforms are seen from the stages and factors that influence the classification of countries based on material welfare. Where developing countries and developed countries apply different systems and methods according to the recommended model. Then it will be known which systems and methods are suitable to be applied based on the problems that occur through the glasses of partnership with the aim of resolving government issues related to financial and non-financial issues with the private sector.

Keywords
Sustainable, Transportation, Reformation, Partnership

Topic
Public Policy, Public Service and Sustainable Development

Link: https://ifory.id/abstract/kFjH4nAfMcwm

Corresponding Author
mukti sintawati

Institutions
Universitas Ahmad Dahlan
Universitas Muhammadiyah Jember

Abstract
This study aims to determine the effectiveness of blended learning towards the improvement of pre-service teacher TPACK (Technological Pedagogical Content Knowledge) in developing multimedia learning mathematics in elementary schools. This research was quasi-experimental. The research method used was the control group pretest-posttest design. The population is the sixth-semester students of the academic year 2018/2019 of the Study Program Elementary Teacher Education Universitas Ahmad Dahlan as many as 315 students grouped in 7 classes. The sample used is one experimental class and one control class taken randomly. The method of collecting data uses observations in multimedia learning mathematics that have been developed by elementary school pre-service teacher. The research instrument uses TPACK assessment sheets that have been validated by experts. The results of the study show that t value is greater than t table. This means that at a significance level of 5% blended learning was effective towards increasing the TPACK of pre-service teachers in developing multimedia learning mathematics in elementary schools.

Keywords
TPACK, Elementary school, pre-service teacher, multimedia

Topic
Mathematics Education

Link: https://ifory.id/abstract/c8zbWQpEdKex

Corresponding Author
Izzah Muyassaroh

Institutions
Yogyakarta State University

Abstract
Facing 21st century, scientific literacy is one of the important skills that must be possessed. Introducing scientific literacy in elementary school is increasingly interesting to be studied because of the great challenges. This is why teaching science in elementary school has to be designed on using innovative media, models, approaches, and learning materials. One of these innovations is ethnomovtale book. Ethnomovtale book is a learning materials developed through 10 stages of R&D model based on Borg & Gall (2003). This research showed that ethnomovtale book was very effective to use as a supportive learning materials to improve scientific literacy in elementary schools. Based on the student and teacher-s responses, ethnomovtale book was so interesting and helpful to students in learning science.

Keywords
Ethnomovtale Book, Scientific Literacy, Science Learning, Elementary School

Topic
Science Education

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

Corresponding Author
Kartika Kartika

Institutions
*Departemen Pendidikan Biologi, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia
**Departemen Pendidikan Biologi, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia

Abstract
Abstract. This study aims to develop teaching materials based on the local wisdom of Indragiri Hilir District, Riau Province, namely "Menongkah Kerang" carried out by the Duano tribe. Teaching materials developed in mollusca material and will contain questions of classification abilities and use a simple determination key made by the author. The research methodology uses the Quasi Experiment method. The study design used quasi-experimental pre-test post-test two group design. Pretest is done before the lesson begins and the posttest is done after the teaching and learning activities. The study uses two classes, one control class only uses textbooks that are in school and one experimental class uses instructional materials that have been developed. The validation results from the three lecturers were very good and showed that the teaching material was valid and could be used. Based on the results of the pretest and posttest the students classification abilities increased, as evidenced by the posttest results of the average student increasing. In conclusion, this teaching material is very feasible to use in learning.

Keywords
Development of teaching materials, local wisdom, duano tribe, classification ability, mollusca

Topic
Biology Education

Link: https://ifory.id/abstract/PDgU72TGJ8Xb

Corresponding Author
La Choviya Hawa

Institutions
a) Department of Agricultural Engineering, Universitas Brawijaya
Jl. Veteran, Malang 65145, East Java Province, Indonesia

*la_choviya[at]ub.ac.id

Abstract
Potato (Solanum tuberosum L.) is world-s main crops that owing poor storability characteristic in unprocessed state due to high water content. One of most widely used preservation method for vegetables such as potato is drying process with steam blanching and osmotic dehydration as pretreatment. Blanching and osmotic dehydration pretreatment are used for reducing water content as well as enhance dried product quality by immersing the product into hypertonic solution. In present study, potato slice blanched by steam for 3 min then soaked into three different type of salt as osmotic agent, i.e. NaCl, KCl and CaCl2 with different concentration (10, 15, and 20% (v/v)). The drying process was conducted using hot air dryer at 40°C for 4 h. The results indicated that higher concentration of hypertonic solution give greater water loss and solid gain value. The initial water content of pretreated potato slice was significantly decreased due to osmotic dehydration compared to non pretreated slices. The final potato slice water content with 10% KCl of pretreatment was slightly lower than other pretreatment combination. The drying rate of potato slices with 10 and 20% of CaCl were the lowest rate with almost similar pattern. Pretreatment with 10% CaCl was considered as the most effective pretreatment in terms of better surface color and minimum shrinkage of potato slice. The microscopy image showed that starch granules of potato were spread and invisible due to starch gelatinization. The appearance of cell wall was not clear with less shrinkage of potato microstructure.

Keywords
Drying, Drying kinetics, Osmotic dehydration, Physical alteration, Salt solution

Topic
AGRICULTURAL ENGINEERING

Link: https://ifory.id/abstract/jYNmGhwXJn3H

Corresponding Author
La Choviya Hawa

Institutions
a) Department of Agricultural Engineering, Universitas Brawijaya
Jl. Veteran, Malang 65145, East Java Province, Indonesia
b) Department of Bioprocess Engineering, Universitas Brawijaya
Jl. Veteran, Malang 65145, East Java Province, Indonesia

*la_choviya[at]ub.ac.id

Abstract
Fermented seed of the tropical tree Pangium edule Reinw., locally known as kluwak, have been used as spices in Asian and especially Indonesia cuisine. For further processing and post harvest handling, physical and mechanical properties of the seed are needed. Some physical properties, i.e. length, width, thickness, geometric mean diameter, unit mass and per 100 seeds, sphericity, surface area, true density, bulk density, porosity, peel ratio, and angle of friction at five different surface (cardboard, stainless steel, iron plate, glass, and wood) of kluwak seeds were evaluated at the market moisture content (50.1%). Also, some mechanical properties, i.e. compressive force, strain, stress and Young modulus at three dimensions axis have been measured. The average length, width, thickness, geometric mean diameter, unit mass and per 100 seeds were 44.94±5.6 mm, 43.35±5.2 mm, 27.40±3.4 mm, 37.36±3.2 mm, 11.47.±3.7 g and 1693.39±483.85 g. In the market moisture content, the results indicated 0.87±0.07, 4413.99±733.22 mm2, 1.01±0.01 g/cm3, 0.42±0.03 g/cm3, 58.21±3.37% and 69.10±13.84% for average sphericity, surface area, true density, bulk density, porosity and peel ratio of the seed, respectively. Angle of friction for respective cardboard, stainless steel, iron plate, glass, and wood were 25.52±6.9 deg, 17.40±3.92 deg, 21.40±5.2 deg, 12.27±42 deg, and 24.8±7.45 deg. The average compressive force needed to break the seed at length, width, and thick axis were 295.34±87.95 N, 283.87±83.90 N, and 215.71±65.53 N. The strain, stress, and Young modulus were 0.095±0.03, 2.10±0.71 N/mm2, and 23.16±7.20 N/mm2 at length axis; 0.069±0.03, 2.66±0.88 N/mm2, and 45.44±20.95 N/mm2 at width axis; 0.05±0.02, 2.05±0.63 N/mm2, and 48.12±22.61 N/mm2 at thick axis, respectively.

Keywords
Fermented kluwak, Physical properties, Mechanical properties

Topic
AGRICULTURAL ENGINEERING

Link: https://ifory.id/abstract/tLCT29MjuYJy