bluuebunny/crossref_metadata_2025 huggingface dataset:
PENGGUNAAN PENDEKATAN CONTEXTUAL TEACHING AND LEARNING (CTL) PADA PEMBELAJARAN IPS DI SEKOLAH DASAR
Authors: Farida Farida
Published: October 2017

Dalam penelitian ini, peneliti menggunakan pendekatan contextual teaching learning (CTL) untuk meningkatkan hasil belajar IPS siswa. Tujan penelitian ini menggambarkan perencannaan, penerapan, dan hasil belajar di SDN Labor Pembangunan UNP. Jenis penelitian ini adalah penelitian tindakan kelas, dengan pendekatan kualitatif dan kuantitatif, penelitian ini menggunakan 2 siklus. Hasil penelitian ini menujukan hasil belajar meningkat dari KKM 75. Pada  perencanaan pembelajaran mendapatkan rata-rata 68,86% naik menjadi 88,50%, aktivitas guru 70.33% menjadi 88.18%, aktifitas siswa dari 72.52% menjadi 85.62%, dan hasil belajar dari 67.26 menjadi 82.44. Hal ini menunjukan bahwa pendekatan CTL dapat meningkatkan hasil belajar siswa di sekolah dasar Kata kunci: CTL, IPS  USAGE OF CONTEXTUAL TEACHING AND LEARNING (CTL) APPROACH TO IPS LEARNING IN ELEMENTARY SCHOOL AbstractThrough this research, researchers use the approach of contextual teaching and learning (CTL) to improve student learning outcomes in IPS learning. The purpose of this study is to describe the planning, implementation, and learning outcomes in SD Development Laboratory UNP Padang. This type of research is a classroom action research, with a qualitative and quantitative approach, this approach consists of two cycles.The results of this study indicate that student learning outcomes increase from KKM learning 75. In the first cycle of lesson planning get an average score of 68.86% to 88.50%, teacher activity 70.33% to 88.18%, student activity 72.52% to 85.62%, and results student learning 67.26 to 82.44. It can be concluded that the use of contextual teaching and learning approach (CTL) can improve student learning outcomes in Primary School Keywords: CTL, IPS
PENGARUH MODEL PEMBELAJARAN MULTILITERASI TERHADAP KEMAMPUAN MEMBACA SISWA SEKOLAH DASAR
Authors: Dafit Febrina
Published: October 2017

Penelitian ini dilatarbelakangi oleh kemampuan siswa SD yang masih kurang dalam memahami bacaan secara kritis dan kreatif pada pembelajaran membaca. Penelitian ini bertujuan mengetahui dan mendeskripsikan pengaruh model pembelajaran multiliterasi terhadap kemampuan membaca siswa SD. Metode yang digunakan dalam penulisan ini adalah eksperimen kuasi dengan desain non-equivalent control group pretest posttest. Data yang dikumpulkan untuk menjawab pertanyaan penelitian yaitu data hasil pretest dan posttest kemampuan membaca dari siswa kelas eksperimen dan kelas kontrol. Teknik pemberian tes yaitu tes obyektif pendekatan pilihan ganda (multiple choice) dan essai. Perlakukan (treatment) yang diberikan adalah model pembelajaran multiliterasi pada kelas eksperimen, sedangkan kelas kontrol tidak belajar dengan model pembelajaran multiliterasi. Hasil skor rata-rata posttest kelas eksperimen adalah 18,76, sedangkan skor rata-rata posttest siswa kelas kontrol adalah 16,04. Dari hasil penulisan tersebut menunjukkan bahwa model pembelajaran multiliterasi memberikan pengaruh pada kemampuan membaca siswa SD. Kata kunci: Pembelajaran multiliterasi, kemampuan membaca  THE EFFECT OF TEACHING MULTILITERACY MODEL IN READING SKILL OF ELEMENTARY STUDENTS Abstract This study is backed by the lack of competence of elementary students in terms of comprehending a text critically and creatively in teaching reading. The method used in the study  is quasi-experiment for which its design is non-equivalent control group pretest posttest.  The collected data that answer the research questions is derived from pretest and posttest of reading skill shown both students from the experiment and control class. The  technique of test is objective test approaches, multiple choice and essay for reading skill. Teaching multiliteracy model as the treatment in this research is applied for the experiment class but the control class is not. The everage score of posttest in reading skill for the students in the experiment class showed 18,76 and the students in the control class showed 16,04. The result of study points out that teaching multiliteracy model gives an effect for the students in reading skill. Keywords: learning multiliteracy model, reading skill
WORLD WIDE WEB 3.0 UNTUK DAKWAH: MANFAAT DAN STRATEGI PENGGUNAANNYA
Authors: Nurdin Nurdin
Published: October 2017

World wide web has been significantly improved since it was founded in 90s. Currently, we use web 3.0 or the third generation web which is a semantic and personalized web. Previous studies found that web 3.0 has been effectively used for many purposes such as business, politic, efucation, etc. Web 3.0 is considered able to imporove user experiences in fullfiling their information needs because it is more personalized and real time as well as able to underatnd user needs. Eventhough benefits of use of web 3.0 has been proved in previous studies, Muslim yet to underastand how the web 3.0 can be utilized in dakwah activities. This study, therefore,  will provide insight on how web 3.0 platform can be used for dakwah purposes. Through the use secondary data analisis approach , this found that interesting and maeningful dakwah is potentially can be delivered through platform web 3.0. There are a number of strategies to maximize the use of web 3.0 for dakwah. Those includes creating social media accounts, digitalization of Islamic teaching materials and store them in cloud system storage, and personalization of dakwah materia. In conclusion, web 3.0 can be used for dakwah purposes through appropriate strategies as found in this study.  Muslim individual and groups should  improve their knowledge and skills in using web 3.0 for dakwah purposes. The limitation of this study is that the data was gathered form secondary sources only. Future reseach need to test through an empirical environment to increase validity.
TELEVISI SEBAGAI MEDIA DAKWAH
Authors: Arif Arif , Samsinas Samsinas , Mangasing Mansur
Published: October 2017

Islam is one of the divine religions that emphasizes the importance of da’wah (Islamic preaching) activities. Therefore, da'wah becomes one of the activities of every Muslim in his life. Da’wah can be done through various ways and media, both visual and audio visual, such as television and others. Television is very effective in delivering content of da’wah, because in this modern era television has been entering in almost all the homes of the people as audiences of da’wah. The most important is to display the right content with competent speakers, and with the right program or event as well. In this case, Televisi Republik Indonesia (TVRI) Central Sulawesi created a program called Lentera Hati. This is a program of Islamic da’wah that is broadcasted on every Thursday at 20.00 pm. The content is delivered through the presentation of the material by a competent speaker. Thus, the goal of da’wah to the people of Central Sulawesi as audiences can be achieved.
LENTERA QALBU SEBUAH PROGRAM DAKWAH RADAR TV PALU
Authors: Abdullah Abdullah , Nurdin Nurdin
Published: October 2017

This paper discusses the role of Radar TV Palu in spreading Islam. As a medium of da’wah (Islamic propagation), Radar TV is very concerned with the mission of Islamic da’wah so that programs of da’wah were made optimal to reach the audience especially those who are Muslims. To that end, Radar TV produces Lentera Qalbu as a program of da’wah, which becomes a medium for the Muslim community of Palu and its surrounding areas to study Islam. In addition, broadcasting programs of da’wah provides another alternative that can eliminate the saturation of the community due to flood of entertainment programs that tend to be contradictory to da’wah mission.
ISLAM GAYO: STUDI TENTANG AKULTURASI ISLAM DENGAN BUDAYA LOKAL DI KABUPATEN ACEH TENGAH
Authors: Mustafa Ali , Hidayat Rahmat
Published: October 2017

This paper explores the acculturation of Islam with local culture in the Gayo highlands, district of Central Aceh. The study focused on both the process of acculturation of Islam and local culture in the ceremonies of birth, marriage and death. In this process, Gayonization of Islam is dominant in comparison to Islamization of Gayo’s culture. In Gayonization of Islam, the terms, actions, and equipments used in the ritual is a purely Gayo’s culture, but Islamic values and teachings are inserted in it. The acculturation process occurred in four stages such as accomodating islamic preaching, identification, Gayonization, and implementation. Furthermore, the acculturation of Islam with Gayo’s culture in and the ceremonies of birth, marriage, and death, can be grouped in three forms: 1) the acculturation of Islamic values with customary objects, in which the objects are ascribed as symbols of Islamic values; 2) the acculturation of Islamic values with the traditions, in which customary practice are attributed as a symbol of Islamic values; and 3) the acculturation of Islam with customary practice, in which customary practice is based on Islamic teachings. At the first and second forms, it can be said that there is  a shift from a custom-based meaning to Islam-based meaning (substitution of meaning). While at the third form, occurred the infusion of Islamic values to traditional ritual (addition to the rites).
IMPLEMENTASI ISLAM INA-INA PEDAGANG KELILING DI KECAMATAN PALU BARAT KOTA PALU
Authors: Samsinas Samsinas
Published: October 2017

This paper deals with the societal structure where ina-ina live, and its influences toward their religious life, which in turn, gives impacts on their social interaction either in family or social environment. Sociologically, female peddlers (ina-ina) are part of Muslim community in their village. They are responsible for their family and society, establishing social harmony. Although female peddlers are economically poor, they do not want to be burden for the governnent and other people. Their religious commitment becomes a basis of power to survive, living a positif live for the future of their family especially their children. They recognize that this life is a mandate and which should be lived with pleasure. The factors that influence ina-ina female peddlers in such vilages as Tipo, Loli and Kanuna, include economic, social, cultural, educational, political and religious. It is these factors that define ina-ina female peddlers’ religious life.
TRANSFORMASI KAJIAN KEISLAMAN PADA LEMBAGA DAKWAH KAMPUS (LDK) JUNDULLAH IAIN PALU
Authors: Mariam Mariam , Syamsuri Syamsuri , Mangasing Mansur
Published: October 2017

LDK Jundullah is organization of da’wah (Islamic preaching) in IAIN Palu that has concerned with Islamic studies. Therefore, students and also community can understand Islam as a religion that is able to form a good character. In addition, Islamic studies can be alternative to relieve a boredom for society due to the emergence of new schools in Islam that are in contradicton with the Quran and Sunnah. This organization carry out activities such as organizing seminars, training of preacher, weekly meeting (liqo), two-level training (daurah) for new comers, female Muslim activities, and economic empowerment. The activities done by the activists of LDK Jundullah are focused on good character and exemplary in campus and society.
Urban Growth, Liveability and Quality Urban Design: Questions about the efficacy of urban planning systems in Auckland, New Zealand
Authors: Beattie Lee , Haarhoff Errol
Published: October 2017

Preventing sprawl and concentrating future urban growth at transit centres, typifies many urban planning strategies in a number of Australian, New Zealand and North America cities. Newer iterations of these strategies also argue that compact development delivers public benefits by enhancing urban ‘liveability’ through good urban design outcomes. Where neoliberal economic conditions prevail, achieving these aims is largely dependent on market-driven development actions requiring the appropriate urban planning responses to ensure these outcomes. However, there are growing concerns that urban planning approaches currently used are not effectively delivering the quality urban design outcomes expected and enhancing residents’ liveability. This paper reports on an evaluation of three medium density housing developments located in areas designated for intensification in Auckland, New Zealand. Examined is the extent to which the development outcomes are aligned with the statutory urban planning requirements for quality urban design. The results indicated contradictions and points to limitations of the statutory planning system to positively influence quality outcomes, leading to enhanced residents’ experiences.
The Relationship between Environment and Economic Growth in Asia - Pacific Countries
Authors: Thao Nguyen Thi Phuong , Hien Nguyen Thi Tam , Thuong Vu Thi
Published: October 2017

This study provides experimental evidence of the relationship between environment and economic growth in the 17 Asian - Pacific countries during the period 2005-2011. Applying various econometric methodologies, including Pool OLS, FEM, REM, FGLS, and GMM, this paper indicates the inverted U-shaped relationship between environmental quality and economic growth. In addition, this research points out the positive connection between energy consumption and environmental degradation.
TThe Impact of Quality of Resources on Total Factor Productivity of Enterprises in Vietnam
Authors: Dut Vo Van , Ai Phan Ngoc Nhan , Thuan Nguyen Xuan , Anh Tran Que
Published: October 2017

This study investigates the effect of quality of resosurces on Total Factor Productivity of enterprises in Vietnam. Using neo-classical growth theory of Solow (1956), we hypothesize that quality of capital and labor is positively related to Total Factor Productivity of enterprises in Vietnam. The study uses the survey data extracted from the Enterprise Survey data set of World Bank in 2015 and 2009 to test the proposed hypotheses. OLS regression shows that our hypothesis is strongly supported under controlling the characteristics of enterprises.
Foreign Ownership and Liquidity Risk of Commercial Banks in Vietnam
Authors: Vinh Vo Xuan , Duc Mai Xuan
Published: October 2017

This paper investigates the impact of foreign ownership on liquidity risk of commercial banks in Vietnam during the period 2009-2015. The regression analysis of panel data is used in the paper with the data collected from 35 Vietnamese commercial banks. The results show that higher foreign ownership is associated with lower liquidity risk of banks. In addition, credit risk and liquidity risk in previous year have a positive relationship with liquidity risk of banks in current year. The results of the study provide empirical evidence to support the important role of foreign ownership in liquidity risk management and other operations of commercial banks in Vietnam.
Determinants of Offshore Fishing Vessel’s Output in Southern Central Coast Region: An Empirical Approach
Authors: Nguyen Hoang Hiep
Published: October 2017

This paper uses econometric models to estimate factors determining offshore fishing vessel’s output in Southern Central Coast region. The estimated findings indicates that factors namely the residential characteristics, types of fishery, engine power, vessel’s years, fishing technology, modern fish finder, number of days per trip, captains’s experience, participation in fishing teams have significant impacts on offshore fishing vessel’s output. Meanwhile, captains’s age and education level as well as fishing ground do not affect this factor. In addition, we find out that fishing stimulation, especially in the application of modern technologies to seafood exploitation and the elimination of empiricism is important to offshore fishing vessel’s output. The findings allow us to bring forward some policy recommendations for central and provincial governments to improve offshore fishing vessel’s output in Southern Central Coast region.
The Application of “Good Governance” Model in Vietnam
Authors: Diep Pham Thi Hong
Published: October 2017

The term “Governance” has been used since 1990s in the process of public sector reform and implementation of new public management models in many countries. The model “Good Governance” has eight basic characteristics namely: Participatory, consensus oriented, accountable, transparent, responsive, equitable and inclusive, effective and efficient, rule of law followed. In the process of international economic integration and development, the application of the above-mentioned characteristics on the governance in Vietnam is an important complement to the development and modernization of public management. This paper analyzes the context of implementing “Good Governance” in Vietnam, evaluates achievements and challenges in several aspects such as building the rule of law, enhancing transparency and anti-corruption, strengthening the participation of the people, strengthening accountability, consensus, and proposes recommendations to promote public management reform in the time to come.
Vulnerability to Landslides Assessment for Agricultural Production in Ha Giang Province
Authors: Thi Nhung Nguyen
Published: October 2017

Forward transaction has been appearing in Vietnam since 2000. Specific to coffee product, forward operation through commercial banks has been known since 2004 and officially traded on BuonMaThuot Coffee Exchange Center (BCEC) in 2011. So far, the volume as well as value of coffee forward transaction in Vietnam is still very limited. By observing and analyzing the actual transaction data in Vietnam, the authors pointed out four main reasons causing to this poor situation, including: (i) There still exists some shortcomings in Vietnamese law system for Commodity Exchange; (ii) The transaction on VNX and BCEC does not bring the benefits to the participants or speculation opportunities to investors; (iii) Financial institutions have not demonstrated their active roles in the market and participated in the establishment of a reliable clearing system on the Commodity Exchange; (iv) Supportive infrastructure is not good enough in Vietnam. In addition, the authors proposed some implications in order to develop forward operation for coffee products as well agricultural products generally in Vietnam.
Modelling Stock Market Volatility: Evidence from Vietnam
Authors: Van Toan Ngo , Tien Ho Thuy , Hoai Ho Thu
Published: October 2017

This study empirically investigates the volatility pattern of Vietnam stock market based on time series data which consists of daily closing prices of VN-Index during the period 2005-2016. The analysis has been done using both symmetric and asymmetric Generalized Autoregressive Conditional Heteroscedastic (GARCH) models. Based on Akaike Information Criterion (AIC) and Schwarz Information Criterion (SIC) criteria, the study proves that GARCH (1,1) and EGARCH (1,1) are the most appropriate model to measure the symmetric and asymmetric volatility of VN-Index respectively. The study also provides evidence of the existence of asymmetric effects (leverage) via the parameters of the EGARCH (1,1) model that show that negative shocks have significant effects on conditional variance (fluctuation). Meanwhile, in the TGARCH (1,1) model, the findingss are not as expected. This study also provides investors with a tool to forecast the rate of return of the stock market. At the same time, the findings will help investors determine the profitability and volatility of the market so that they can make the right decisions on holding the securities.
KINETIC MODELING STUDY FOR ACYLATION REACTION OF O-XYLENE TO 3,4-DIMETHYLBENZOPHENONE OVER H-BETA
Authors: - Yusnimar
Published: October 2017

ABSTRACTThe reaction of o-xylene with benzoic anhydride has been studied by the changing molar ratio of the reactants (20:1, 10:1, and 5:1) in a batch reactor under reaction temperature 120oC. The reaction carried out without catalyst and also with catalyst Zeolite beta which was activated at 300oC overnight. HPLC analysis results showed that the yield of the product increase with the changing molar ratio of the reactants. An attempt was made in determining the kinetics of the reaction. The results show that the reaction is neither first nor second order in the acylating agent. Obtaining the reaction order even initially is unsuitable for even simple reactions that do not go to completion. It is even less applicable where more than a single process which affects the rate is taking place right from the start. These might be any one or combination of diffusion, adsorption, desorption, inhibition of the reaction by the product and multi step reactions on the surface. Postulated reaction mechanisms may be required in combination with experimental data to determine even initial reaction orders. Key words: o-xylene, catalyst, kinetics, reaction order.
Kinetika dan mekanisme sistem transpor Cd(II) antar fasa melalui teknik membran cair fasa ruah dengan oksin sebagai zat pembawa
Authors: Kahar Zaharasmi , Mustafa Djufri , - Wiwit
Published: October 2017

ABSTRACT The transport and separation of Cd(II) through  bulk liquid membrane technique had been investigated and optimised. Cd(II) was transported  through a liquid membrane  of  chloroform solution containing oxine as mobile carrier and  received by EDTA in stripping phase. In compliance with optimum condition, the flux of Cd(II) crossing the membrane was studied, and applied further into a model of the transport system and kinetics mechanism. Concentration of Cd(II) in feed  and stripping phases were experimentally determined, and monitored by the atomic absorption spectrophotometer at lmaks 228.8 nm.  The model curve of time dependence of Cd(II) reduced concentrations in the feed, membrane and  stripping phases show good agreement and characterized as a transport system for Cd(II) interphase involved two consecutive irreversible first order reactions. The rate constant of transport at temperature 28°C are k1 0.0416 minutes-1, k2 0.0354  minutes-1 and  activation energy  32.96 kJ mol-1
AN IN-SYRINGE La CO-PRECIPITATION METHOD FOR PRE-CONCENTRATION OF OXO-ANIONS FORMING ELEMENTS IN SEAWATER FOLLOWED BY ICP-MS MEASUREMENT
Authors: Rahmi Dwinna , ZHU Yanbei , Fujimori Eiji , Hasegawa Takuya , Umemura Tomonari , Konagaya Shigeji , Haraguchi Hiroki
Published: October 2017

Vol. 1 No. 1ABSTRACT A lanthanum (La) co-precipitation method was explored for pre-concentration of oxo-anion forming elements followed by measurement with Inductively Coupled Plasma Mass Spectrometry (ICP-MS).  The co-precipitation and subsequent washing and elution steps were performed in a 25 mL-volume syringe in order to save the sample consumption and to avoid the contamination from the experimental environment.  In the present work, various parameters such as the concentration of La added into the sample solution, the pH, aging time, and so on were optimized to obtain good recoveries and analytical detection limits for V, As, Se, Sb, and W.  Generally, in the co-precipitation method, high concentration of precipitant (in this case, La) causes a serious problem of signal memory effect in ICP-MS measurement. To reduce such memory effect, in the present experiment, high level of La was removed by passing the analyte solution (i.e., lanthanum hydroxide dissolved in 1 M HNO3) through a mini column packed with cation-exchange resins.  The method thus obtained was evaluated through the measurement of V, As, Se, Sb and W in seawater reference materials (CASS-4 and NASS-5). The recoveries exceeded 80%, and the observed values were in good agreement with the certified values. Thus, the present method was applied to the determination of trace elements in real seawater sample.    Keywords: Lanthanum, pre-concentration
TRANSPOR ION TEMBAGA (II) MELALUI TEKNIK MEMBRAN CAIR FASA RUAH
Authors: Tetra Olly Norita , Alif Admin , A Hermansyah , - Emriadi
Published: October 2017

ABSTRACT Bulk liquid membrane methode have been used to study transport  of  Cu(II) ion containing oxine as carrier. It was found that total Cu(II) ion 20 ppm was transported from source phase to receiving phase after 360 min reached 97.3 % in optimum conditions source phase pH is 3, oxine concentration as carier in membrane phase is 17.5 x 10-4 M, membrane volume is 20 mL, sulfur acid concentration in receiving phase 0.15 M and time of balance is 15 minute. Thus a pH gradient is utilized to drive the Cu(II) transport.
PEMBUATAN LAPISAN TIPIS DAN SERBUK TIMBAL TITANAT DENGAN METODA SOL GEL
Authors: - Rahmayeni , - Emriadi , Susanti Eli , Silvia Delfi
Published: October 2017

ABSTRACT Thin layer and powder of lead titanate had been prepared using lead acetate and tetraethylorthotitanate as precursor by sol gel process. The thin layer of composite was obtain through layering the composite on glass substrate. Both thin layer and powder were calcined between 100-700°C and were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), UV and Fourier Transform Infra Red (FTIR). The diffraction pattern show that the structure of composite on glass substrate is amorf at 500°C and could not identified at 700°C while the powder is crystalline at 500 and 700°C. FTIR spectra shown the Ti-O peak at 1407 cm-1, the Pb-O and Pb-O-Ti peaks at 718 and 600 cm-1, respectively.
DEGRADASI ZAT WARNA NAPHTOL BLUE BLACK SECARA SONOLISIS DAN FOTOLISIS DENGAN PENAMBAHAN TIO2-ANATASE
Authors: - Safni , - Maizatisna , - Zulfarman , Sakai T.
Published: October 2017

ABSTRACTDegradation of naphtol blue black dye had been done by sonolysis and photolysis with adding anatase-TiO2. Sonolysis method were performed using an ultrasound with frequency 45 kHz, and photolysis using an irradiation of UV light l= 359 nm.  The optimum condition for degradation of 6 mg/L naphtol blue black by sonolysis with addition of 0.1000 g anatase-TiO2 were found at pH = 3.0 and temperature 30 ± 1°C.  Percentage of degradation at pH and temperature optimum was 65.20% within 120 minutes treatment.  Degradation of 6 mg/L naphtol blue black by photolysis with addition of 0.1000 g anatase-TiO2 was optimum at pH=3.0 and percentage of degradation was 68.72% within 120 minutes irradiation without stirring. The combine of sonolysis and photolysis method simultaneously for degradation of naphtol blue black dye by adding anatase-TiO2, achieved 92.51% degradation after 60 minutes treatment. Keywords : sonolysis, photolysis, naphtol blue black
SUPLEMENTASI BAGASE DENGAN ENZIM SELULASE DAN PENGARUHNYA TERHADAP KECERNAAN BAHAN KERING, BAHAN ORGANIK DAN SERAT KASAR SECARA IN VITRO
Authors: Marlida Yetti , Zain Mardiati
Published: October 2017

ABSTRACTSupplementation of cellulase enzyme to agro-industrial residues can increase the nutritional value of the product. Advances in industrial biotechnology offer potential opportunities for economic utilization of agro-industrial residues such as palm pres fiber, rice straw, corn straw and bagase for animal feed. Bagase is a complex material, is the major by product of the sugar cane industry.  This experiment examined the effect of applying a cellulase enzyme (Siqma & Co) on the digestibility of bagase in vitro.  The enzyme was applied in liquid form at  concentrations 1.0; 1.5 and 2.0 (g/100 g DM) to bagase. The bagase was incubated with enzyme for 48 h before in vitro digestion. The digestibility of dry matter, organic matter and fiber  in vitro was detected. The results showed that digestibility of dry matter, organic matter and fiber were significantly different (P<0.01) across treatments. The increased of the cellulase enzyme supplemented to bagase can increased the nutritive values of the product and directly digestibility of dry matter, organic matter and fiber higher.  Results from this study indicated that direct application of enzymes to bagase was capable to improving  digestibility in-vitro. Key words :  cellulase enzyme, bagase, digestibility, in vitro
STUDI PENGARUH PERBANDINGAN REAKTAN LIGNIN NaHSO3 DAN pH TERHADAP NATRIUM LIGNOSULFONAT (NaLS)
Authors: Syahbirin Gustini , Suryani Ani , Dzikrulloh Tesar
Published: October 2017

ABSTRACT Lignin was isolated from waste black liquor of soda pulping process. Sulfonation of soda lignin produced Sodium Lignosulfonate (NaLS) which can be used as dispersants, and concrete admixtures. In this research, sulfonation was carried out towards lignin with ratio of lignin-NaHSO3 of 1.0:0.4; 1.0:0.5; and 1.0:0.6, and initial pH of 5.00; 6.00; 7.00. Parameters observed were purity, final pH, and yield of NaLS. The upsurge of initial pH increased the final pH and NaLS yield, but decreased its purity. The upsurge of ratio of lignin-NaHSO3 increased NaLS yield and decreased its purity, but did not affect the final pH of NaLS. The chosen optimum condition was on pH of 6.00 and ratio of lignin-NaHSO3 of 1.0:0.6. Characterization of functional group using FTIR, and purity of NaLS using UV-Visible Absorption Spectrophotometer. Keywords: soda lignin, sulfonation of lignin, sodium lignosulfonate
PEMBUATAN LAPISAN TIPIS TiO2 -DOPED LOGAM M (M= Ni, Cu dan Zn) DENGAN METODA DIP-COATING DAN APLIKASI SIFAT KATALITIKNYA PADA PENJERNIHAN AIR RAWA GAMBUT
Authors: Arief Syukri , Alif Admin , Willian Nancy
Published: October 2017

ABSTRACT Preparation of TiO2-doped M (M = Ni, Zn and Cu) has been prepared on glass substrate using dip-coating technique. Titanium isopropoxide (TIP), Ni(OAct)2.4H2O, Zn(OAct)2.2H2O dan Cu(OAct)2 were used as starting materials and diethanolamine (DEA) as additive in isopropanol solution. Solutions were prepared by mixing of various concentration of metals (1, 3 and 5 mol %)  in 0.5 M TIP solution. Thin films were performed by immersion of glass substrate into solution by withdraw speed of 20 cm/min. Coated glass were dried at 100 – 110°C and heated at 500°C the process were repeated for several time. The product was characterized by XRD and showing TiO2 layer of anatase structure. EDX analysis has shown that thin films have found of Ti and doped-metal. Their crystallized sizes were calculated by Scherrer formula shown that it obtained in various in range of 12-21 nm. According to transformation effectively of titania doped M in peat swam water shown that catalytic activity 34.4 – 53.7% for the irradiation during 24 hours. Keywords : titania, thin films, photocatalytic properties
OPTIMALISASI TRANSPORT SELEKTIF ION Ni(II) TERHADAP Cd(II) DENGAN ZAT PEMBAWA OKSIN MELALUI TEKNIK MEMBRAN CAIR FASA RUAH SECARA SIMULTAN
Authors: Ningsih Vera Tri , Alif Admin , Aziz Hermansyah
Published: October 2017

ABSTRACT The selective transport of Ni(II) to Cd(II) through simultaneously liquid membrane technique has been investigated. The cell membrane was made by mixturing Ni(II) and Cd(II) ions at concentration as 3.41x10-4 M and 1.78x10-4 M respectively as source phase, oxine in chloroform as membrane phase and Na2EDTA solution as receiving phase. Concentration of recidual Ni(II) and Cd(II) ions in source phase transported to receiving phase was measured by Atomic Absortion Spectrofotometry (AAS). The results showed the at optimum condition of Ni(II) and Cd(II) transport occurred at source phase of pH 7, oxine concentration 0.001 M in chloroform and 0.04 M Na2EDTA solution pH 7. In this condition, Ni(II) and Cd(II) transport selectivity was found 80.89%. From the experiment, it was found that the transport rate constant from source phase to membrane phase (k1) for Ni(II) (0.7544 per hour) smaller than Cd(II) (1.3800 per hour ), on the other hand the transport rate constant from membrane phase to receiving phase (k2) Ni(II) (2.7580 per hour) greater than Cd(II) (1.3790 per hour). The phase-to-phase transport of Ni(II) and Cd(II) was consecutive first order reaction.  Keywords : bulk liquid membrane, oxine, technique
DETERMINATION OF CALCIUM (Ca) AND MAGNESIUM (Mg) CONTENT IN CACAO (Theobroma cacao Linn) FERMENTATION AND NON FERMENTATION BY SPECTROPHOTOMETRY
Authors: - Wiranda , Syukur Sumaryati , Aziz Hermansyah
Published: October 2017

ABSTRACT Cacao beans contain many kinds of mineral, magnesium (Mg), calcium (Ca), Zinc (Zn), Phosphor (P) and etc. This study investigated magnesium (Mg) and calcium (Ca) in fermentation and non fermentation cacao beans by atomic absorption spectrophotometry. Mg and Ca, content in non fermentation cacao beans of green and red variety are 453 µg/g, 466 µg/g, and 491 µg/g, 445 µg/g. Mg and Ca, contents  in fermentation cacao beans of green and red variety are, 596 µg/g, 528 µg/g, and 554 µg/g, 505 µg/g. Fermentation make magnesium (Mg) and calcium (Ca) content increase significantly. Keywords : Theobroma cacao Linn, fermentation, spectrophotometry.
PEMANFAATAN PERLIT YANG TELAH DIMODIFIKASI UNTUK AMOBILISASI ENZIM BROMELAIN
Authors: Mardiah Elida
Published: October 2017

ABSTRACT Amobilization of bromelaine enzyme extracted from ananas fruit (Ananas comusus) acetone has been done. Modified perlite in the amino silica phosphat (ASP) is used as matrix amobilization.  The protein content has determined by Lowry method, while enzyme activity were determined by Anson method caseine as substrate. It native enzyme specific activity was 0.1281 unit/mg with konsentration 20000 ppm, pH 7.0, incubation time 35 minutes, and  temperature 40°C. Amobil bromelaine specific activity was 0.7438 units/mg with substrate on 20000 ppm pH 7.0, incubation time 30 minutes and temperature 37°C. This bromelaine enzymes activity was increased six times than native enzim and showed the activity for several repeatation. Keywords: perlit, enzim bromelain, amobilization
STUDY ON ANTI-MICROBIAL PROPERTIES OF Enicosanthum membranifolium SINCLAIR AND Enicosanthum cupulare (KING) AIRY-SHAW
Authors: Efdi Mai , Koketsu Mamoru , Watanabe Kunitomo , - Nurainas
Published: October 2017

ABSTRACT n-Hexane and ethyl acetate fractions of methanol extracts of two species of Annonaceae, Enicosanthum membranifolium Sinclair and Enicosanthum cupulare (King) Airy-Shaw, were screened for antimicrobial activity against eighteen bacterial strains using agar dilution method. The ethyl acetate fraction of the two Annonaceae plants showed higher antimicrobial activities than the n-hexane fraction. The extracts of the plants tested were significantly more active against gram-positive with minimum inhibitory concentration (MICs) ranging from 0.0625 to 4 mg/mL than against gram negative bacteria (MICs >4 mg/mL). Keywords: Antibacterial activity; Enicosanthum membranifolium Sinclair; Enicosanthum cupulare (King) Airy-Shaw
ISOLASI SENYAWA ALKALOID DARI KULIT BATANG Dehaasia lancifolia BL. Ridl
Authors: Hasnirwan Hasnirwan , Arbain Dayar , Effendy Harry Abrir
Published: October 2017

ABSTRACT Dehaasia lancifolia plant from family of Lauraceae and base on the phytochemical survey in Malaysia and West Sumatera containing alkaloid compounds. The alkaloid compounds containing in Dehaasia lancifolia BL. Ridl has not been isolated and from chemotaxonomy aproximation gave an indication that alkaloid structure not quite difference with one of Phoebe genus of the same family wich has been isolated. The isolated alkaloid compound was obtained in amorf solid phase and yellowish colored in relatively high concentration. The bromide salt of this compound melt at 261°-264°C. UV spectrum indicated the maximum absorbtion band at wavelength 282 and 204 nm wich indicated the chromophoric group of tetrahydroquinoline. IR spectrum shown an absorbtion band at: 3550 cm-1 (stretching C-N), 3030 cm-1 (C-H aromatic), 2930 cm-1 (-CH2- stretching), 2860 (CH aliphatic stretching), 1660-1600 cm-1 (C=C aromatic), 1530 cm-1 (C=N aromatic), 1070 cm-1 (C-O-C stretching) and brommide salt shown an absorbtion band at 2680 cm-1 (>N+-H stretching) and without OH group in this molecule Keywords: dehaasia lancifolia BL. Ridl, alkaloid, spectrophotometer UV and IR
AMOBILISASI KOMPLEK KOBAL(II) PADA POLI(4-VINILPIRIDIN) DAN KARAKTERISASINYA
Authors: - Syukri , - Safni , Fadhilla Anna
Published: October 2017

ABSTRACTAcetonitrile ligated cobalt(II) complex was successfully immobilized on poly(4-vinylpyridine) (P4VP). The grafted material was characterized by Fourier Transform Infra Red (FTIR), Scanning Electron Microscope (SEM), UV-Visible Spectrometry, Thermal Gravimetry-Differential Thermal Analysis (TG-DTA) and Atomic Absorption Spectrophotometry (AAS). The FTIR measurement confirmed a successful grafting indicated by the presence of a weak donor-acceptor interaction between N of poly(4-vinylpyridine) with the Co2+ of the complex. A change of surface morphology after immobilization process was evidenced by SEM photographs. TG-DTA analysis showed that the attached Co(II) complex on P4VP was found to be moderately thermally stable. The metal leaching of the obtained heterogeneous catalyst measured by AAS was found to be less than 0.1%. Keywords: Immobilization, Grafting, Heterogeneous catalyst, Donor-acceptor interaction, Surface area, Metal leaching
PENENTUAN PENETRASI AIR DAN HIDROKARBON DARI KRISTAL CAIR LAMELAR DALAM SISTEM GARAM NITRAT, SIKLOHEKSANE DAN LAURIL ALKOHOL POLI ETER
Authors: Amran Ali
Published: October 2017

Abstract Water and hydrocarbon penetrations of the lamellar liquid crystal in nitrate salts (calcium and aluminium nitrates), cyclohexane, and lauryl alcohol polyether (LA4) system have been investigated. Liquid crystal phase which characterized using optical polarizing microscope and small-angle X-ray diffraction, showed  a significantly the water and the hydrocarbon penetrations of aluminium nitrate and calcium nitrate solutions.  Keywords: Lamellar liquid crystal, Optical polarizing microscope, Water and hydrocarbon penetration, Nitrate salts (calcium and aluminium nitrates), Lauryl alcohol polyether (LA4), Small-angle X-ray diffraction.
KARAKTERISASI FISIKOKIMIA DAN LAJU DISOLUSI DISPERSI PADAT IBUPROFEN DENGAN PEMBAWA POLIETILENGLIKOL 6000
Authors: Zaini Erizal , Rahmi Nofita Rahmi x , - Salman , Kurniati Irna
Published: October 2017

Solid dispersions of the antiinflamation drug ibuprofen and polyethylene glycol 6000 (PEG 6000) were prepared by the melting method in order to increase the dissolution rates of this poorly water-soluble compound. The temperature/composition phase diagram of binary system was analyzed by termal analysis hot-stage microscopy, showing an eutectic formation. Polarized light hot stage microscopy and X-ray-powder diffraction confirmed, that solid dispersion technique decrease the crystalliny of ibuprofen after melting and solidifying of a 4/6 (w/w) mixture of ibuprofen and polyethylene glycol 6000 respectively, which the results enhanced dissolution rates compared to the physical mixtures and ibuprofen intact. However, no such chemical interactions in the solid state were confirmed by FTIR spectra which showed the presence of ibuprofen crystalline in solid dispersion.
KINETIKA DAN SELEKTIFITAS SISTIM TRANSPOR Cu(II) ANTAR FASA MELALUI TEKNIK MEMBRAN CAIR FASA RUAH DENGAN MENGGUNAKAN OKSIN SEBAGAI ZAT PEMBAWA
Authors: - Refinel , - Zaharasmi , Tetra Olly Norita
Published: October 2017

ABSTRACTThe effect of addition oleat acid 1.575 × 10-4M into membrane phase had been employed at the optimum condition of Cu(II) transport by the composition Cu(II) 3.15 × 10-4M as source phase with pH 3, oxine 17.5 × 10-4M dissolved into chloroform as membrane phase, H2SO4 0.15 M as receiving phase, stirring rate was 340 rpm. The result of the research showed increase in effectivity of transport Cu(II) interphase from 6 hours to 3 hours with the rate constants into membrane phase extraction (k1) 0.0454 minute-1, the stripping (k2) 0.0364 minute-1 at the temperature of 301°K and activation energy (Ea) 51.147 Kj/mol. The reaction was identified by means of kinetic model involving two consecutive irreversible first order. The selectivity of Cu(II) transport system analyzed to mixed Cu(II) ion with Cd(II), Co(II), Ni(II), Mg(II), Ca(II) and Sr(II) ions in pairing system or totaly system in 1 : 1 comparison. The measurement was performed to each ions that was transported receiving phase and the remains in resource phase by using SSA model Alfa-4. The result of research showed that Cu(II) was selective enough transported.  Keywords: Kinetic transportation, Cu(II) ions, oxine, oleat acid, selectivity
PENENTUAN TINGKAT AKTIFITAS CHOLINESTERASE DARAH YANG KEBIASAAN MENGGUNAKAN OBAT ANTINYAMUK BAKAR PADA PENDUDUK KELURAHAN JATI PADANG
Authors: Sy Elmatris , Alioes Yustini , Irramah Miftah
Published: October 2017

ABSTRACTThis study aims to determine the level of blood cholinesterase activity using a drug habit antinyamuk fuel (OANB), in Kelurahan Jati Padang and analyzed at the Laboratory of Biochemistry at the Faculty of Medicine in April-November 2010. The population is all residents Jati Padang village. The sample is using drugs antinyamuk fuel that is 30 people with sampling techniques eccidental sampling, as control is a resident who does not use drugs antinyamuk (Joan). The results showed: the population of 74 people who came, in getting 30 people to use OANB, 39 people who do not use OANB (liquid and lotion), 5 people who did not use Joan (as control). The average level of blood cholinesterase activity using OANB is 7294.79 u / l, and that does not use Joan is 7645.97 u / l. In conclusion, the average level of blood cholinesterase activity in the population there is a tendency Kelurahan Jati Padang cholinesterase activity levels decreased when compared to controls. Decrease in the average value of cholinesterase activity and a decrease of 5% is still within normal limits. Keywords: drug antinyamuk fuel, cholinesterase
STUDI KOMPARATIF FISIOLOGIS PROBIOTIK Laktat DALAM beberapa MEDIA CAIR GULA SEDERHANA
Authors: - Nurmiati
Published: October 2017

ABSTRACT Several simple sugar liquid media were used to observe the growth of several lactic acid probiotic bacteria were usually used in food probiotic products.  The required of the sugar of the bacteria were observed in liquid media consisting simple sugar such as glucose, fructose, lactose and sucrose by observing the population growth and the metabolite products.  The lactic acid probiotic bacteria were used were Lactobacillus acidophilus, L. casei, L. plantarum, Streptococcus lactis, S. thermophilus, Leuconostoc mesentroides and Pediococcus acidilactisi.  The analysis of the result obtained the growth of populations, the developments of the pH value and total acidity. The results showed that the respond of the probiotics in it’s growth and development to the different simple sugar were vary. Glucose and sucrose are suitable simple sugar for all lactic acid probiotics. S.lactis showed in all media lower average of pH-Value (2.43) than other bacteria after 4 weeks observation. The highest decreasing of pH Value achieved by L.acidophilus Keywords : Lactic acid probiotic bacteria,  Glucose, Sucrose, Fructose, Lactose
THE OPTIMATION SIMULTANEUOS DETERMINATION OF LEAD(II) AND CADMIUM(II) BY ADSORPTIVE STRIPPING VOLTAMMETRY (ADSV)
Authors: - Deswati , Suyani Hamzar , Loekman Umiati , Sari Nilam
Published: October 2017

A selective and sensitive adsorptive stripping voltammetric (AdSV) method for simultaneous determination of lead(II) and cadmium(II) were proposed. The aim of this study was to get the optimum condition for simultaneuos determination of lead(II) and cadmium(II). The parameters were studied such as: variation of accumulation potential, accumulation time, pH, and variation ofcalcon concentration. In this case, the optimum conditions were reached at accumulation potential –0.7 V, accumulation time 80 s, concentration of 0.12 mM calcon, and pH 7.0. At the optimumconditions the relative standard deviation were 2.90% and 1.46% for Pb(II) and Cd(II) respectively for eight replicates (n = 8) measurements. The method was applied for the direct determination of Pb(II) and Cd(II) in sea water around Bungus, Padang City. Concentration Pb(II) and Cd(II) insample were 9.918 μg/L – 27.320 μg/L for Pb(II) and 7.997 μg/L - 32.521 μg/L for Cd(II), with recovery of 99.48%, and 103.28 for Pb(II), and Cd(II) respectively.
UJI SELEKTIFITAS TRANSPOR Cu(II) TERHADAP Mg(II), Ca(II) DAN Sr(II) DENGAN ZAT PEMBAWA OKSIN DAN SDS SEBAGAI ADITIF MELALUI TEKNIK MEMBRAN CAIR FASA RUAH
Authors: Tetra Olly Norita , Kahar Zaharasmi , Alif Admin , Frengky -
Published: October 2017

Selectivity of Cu(II) transport from the source phase containing Mg(II), Ca(II) and Sr(II) into the receiver phase had been researched by using oxine as carrier and Sodium Dodecyl Sulfate (SDS) as additive through bulk liquid membrane.The efficiency of the method depends on parameter (the pH of the donor and acceptor phase, effect of carrier concentrations, and time of transport). The selectivity of the method was assessed by performing the single, as well as the competitive transport experiment of Mg(II), Ca(II,) and Sr(II) ion and then Cu(II) percentage which was transported to receiver phase 99.98% and residue in source phase do not detect. The measurement was done to both of source phase and receiver phase by using Atomic Absorption Spectrophotometer (213.9 nm).
EKSTRAK METANOL DARI DAUN MAHKOTA DEWA (Phaleria macrocarpa) SEBAGAI INHIBITOR KOROSI BAJA DALAM ASAM KLORIDA
Authors: Rahmi Azimatur , - Emriadi , Alif Admin
Published: October 2017

Vol 7 No 2ABSTRACTExtract of Phaleria macrocarpa leaves have been studied as corrosion inhibitor for mild steel ofhydrochloric acid solution 2.0 N. The efficiency of inhibition was evaluated by gasometric methodand electrochemical analysis. The temperature and concentration effects on the inhibitorsperformance were also investigated. The result obtained showed that the extract is one of promisingcandidate as an inhibitors for the corrotions of mild steel in HCl media, inhibition efficiencyincrease as the extract concentration is evaluated. The activation energy (Ea) increase with theaddition of the extract. Where inhibition of extract on the steel surface obey modified Langmuirisotherm equation. Potentiodynamic polarization curve indicated the Phaleria macrocarpa leavesextract play role as the anodic type inhibitor.Keywords : Corrosion inhibition, mild steel, Phaleria macrocarpa, hydrochloric acid.
DEGRADASI RHODAMIN B SECARA FOTOKATALISIS DAN OZONOLISIS DENGAN PENAMBAHAN TIO2-NIFE2O4, TiO2-CuFe2O4, DAN TiO2-MnFe2O4
Authors: - Safni , - Deliza , - Rahmayeni
Published: October 2017

Vol 7 No 2ABSTRACTDegradation of Rhodamin B has been done by photocatalytic and ozonolysis using TiO2-Anatase and TiO2-NiFe2O4, TiO2-CuFe2O4, TiO2-MnFe2O4 catalysts, photocatalytic methodused lamp with λ = 365 nm and ozonolysis methode used ozon reactor. Analysis of degradationresult used spectrofotometer UV-Vis. TiO2-NiFe2O4, TiO2-CuFe2O4, TiO2-MnFe2O4 catalystwere characterized by XRD to determine size and structure of crystal. The solution ofRhodamin-B 2 mg/L was degraded 93,33 % without catalyst after being photolysed for 180minutes and after adding 0,02 g TiO2-MnFe2O4, TiO2-CuFe2O4, TiO2-Anatase, TiO2-NiFe2O4catalyst. The additional consentration in a row are 99,55 %; 99,77 %; 100 %; 100 %. Thesolution of Rhodamin B 2 mg/L was degraded 99,33% without catalyst after being ozonolysisfor 25 minutes and after adding 0,02 g of TiO2- MnFe2O4, TiO2-CuFe2O4, TiO2-Anatase, TiO2-NiFe2O4 catalysts with the additional consentration in a row are 99,77 %, 99,77 %, 99,77 %,100 %. So the degradation of Rhodamin B using ozonolysis method was faster thanphotocatalytic with catalysts and without catalyst.Keywords: Rhodamin B, Photocatalytic, Ozonolysis, TiO2-Anatase, TiO2-NiFe2O4, TiO2-CuFe2O4,TiO2-MnFe2O4.