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All Journal PROSIDING SEMINAR NASIONAL Prosiding Seminar Nasional MIPA Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal Ilmiah Administrasi Publik (JI@P) IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) ASEAN Journal of Chemical Engineering
Endang Tri Wahyuni
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Environmental Science Social Sciences

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Analysis of Student Activity in Learning Thermochemical Materials through Lesson Study Eny Winaryati; Muhammad Agung Stiarso; Endang Tri Wahyuni; Muhammad Taufik Hidayat; Wahono Wahono
Jurnal Pendidikan dan Pembelajaran Kimia Vol 9, No 3 (2020): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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Abstract

Lesson study is a learning strategy that emphasizes collaborative activities on planning (plan), implementation of learning (do), and reflection, with the aim of improving the quality of learning, so that students' learning activities and student learning outcomes become good. The purpose of this study is to analyze the activity and student learning outcomes through lesson study. Activities carried out in 3 (three) cycles. Based on the results of reflection and decisions taken by the model teacher, resulting in the application of different learning models from each cycle. It was concluded that in cycle 1 applying the demonstration method, cycle 2 of the Teams Game Tournament (TGT) learning model, cycle 3 applying the TGT model combined with the LCC method. The learning process with the implementation of Lesson Study in Thermochemical material can improve the activity and learning outcomes in the XI IPA class of SMA Muhammadiyah Gubug, Grobogan Regency, 2018/2019 school year. The recommendations of this study are the need for application of other methods in learning Thermochemical content, and comparing their effectiveness. Key word: Lesson Study, Activity, Thermochemistry        
UPAYA PENINGKATAN PRESTASI BELAJAR SISWA MENGGUNAKAN MODEL PEMBELAJARAN NHT (Numbered Heads Together) Anisa Nur Khasanah; Endang Tri Wahyuni; Andari Puji Astuti
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2017: Prosiding Seminar Nasional Pendidikan, Sains dan Teknologi
Publisher : Universitas Muhammadiyah Semarang

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Penelitian ini bertujuan untuk meningkatkan prestasi belajar siswa menggunakan model pembelajran NHT (Numbered Heads Together) pada materi struktur atom kelas X di SMA Negeri 02 Batang. Penelitian ini merupakan penelitian kuasi eksperimen. Kelompok eksperimen diberikan perlakuan dengan model pembelajaran NHT (Numbered Heads Together), sedangkan pada kelompok kontrol menggunakanmodel pembelajaran ceramah. Variabel penelitian ini terdiri dari variabel bebas yaitu model pembelajaran NHT (Numbered Heads Together) dan variabel terikatnya yaitu prestasi belajar siswa. Populasi dalam penelitian ini mencakup siswa kelas X MIA 1 dan X MIA 3 SMA Negeri 02 Batang  yang berjumlah 72 siswa. Teknik analisis data menggunakan statistik deskriptif dengan uji pengaruh dari kedua kelas. Hasil penelitian terbukti terdapat peningkatkan prestasi belajar siswamenggunakan model pembelajaran NHT (Numbered Heads Together) yang dibuktikan dengan harga r sebesar 0,978. Berdasarkan pernyataan tersebut maka dapat disimpulkan bahwa terdapat pengaruh model NHT (Numbered Heads Together) terhadap upaya peningkatan prestasi belajar kimia siswa pada materi struktur atom kelas X SMA Negeri 02 Batang. Kata kunci: NHT (Numbered Heads Together), prestasi belajar, pembelajaran kimia, struktur atom
EFFECTIVENESS OF SECANG WOOD (Caesalpinia sappan l) CONCENTRATION AS NATURAL INDICATOR FOR ACIDIMETRY METHOD Sri Riris Septianingsih; Ana Hidayati Mukaromah; Endang Tri Wahyuni
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2018: PROCEEDING 1ST INSELIDEA INTERNATIONAL SEMINAR ON EDUCATION AND DEVELOPMENT OF ASIA (INseIDEA)
Publisher : Universitas Muhammadiyah Semarang

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cidimetry is a titration method used to determine acidic levels such as H2SO4,ISBN: 978-602-5614-24-8 Page 245 3 and HCl with methyl red                       (MR)1% w/v as indicator. As synthetic indicator, MR is relatively expensive, therefore a replacement indicator isneeded. This study aimed to investigate the potential of a natural indicator from secang wood (Caesalpiniasappan l) containing brazillin compounds to be used as replacement of MR. The efectiveness of woodconcentration 0.5; 1.0; 1.5 and  2 % w/v used as indicator of acidimetric titration, particularly for standardizingHCl solution was measured. Next, the minimal concentration of wood secang which can be used as indicator ofacidimetric titration was determined. The result showed that secang wood has potential to be used asreplacement indicator of MR. The percentage difference of concentration of HCl solution using MR indicator1.0% with wood concentration 0,5; 1.0; 1.5 and 2.0 % w/v were 6.7; 6.7; 10.0; and 21 % respectively. Minimumconcentration of wood secang that can be used as indicator in acidimetry is 0.5 %b/v.Keywords: acidimetry, secang wood, natural indicator, and synthetic indicator MR
PENYUSUNAN PERENCANAAN PENGEMBANGAN PEGAWAI DILINGKUNGAN PEMERINTAH KOTA SURAKARTA Endang Tri Wahyuni
JI@P Vol 5 No 1 (2018): JI@P
Publisher : Master of Public Administration, Universitas Slamet Riyadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33061/jp.v5i1.2065

Abstract

Wahyuni, 2018. “Preparation Of Employee Development PlanningGovernment Surakarta City“. Slamet Riyadi Surakarta University. Theses.Unpublished.The purpose of this study is to describe and analyze human resourcedevelopment planning ASN (Civil State Apparatus) in order to improve theprofessionalism of the Government apparatus resources City of Surakarta inaccordance with competency needs of the Office.The type of research used the qualitative analysis, the unit is organizations,namely the civil State Apparatus. Yangdigunakan data sources the primarydata and secondary data, do data collection techniques of observation andinterviews, data analysis Techniques in the study: 1 data Reduction) 2) 3 dataRendering) the withdrawal of the conclusion. Results of the study PlanningPengembangnan ASN there are still gaps in aspects of competence by 20%;On the aspect of compensation there is value gap amounted to 0.76, thehighest gap in the Echelon IV of 0.65 on Echelon III of 0.11, it takes the effortof reducing the gap on Echelon Echelon IV and III by giving a salary based onthe performance of the employee in order that the can be fulfilled the elementsof Justice for the performance of employees; On the aspect of performance,employee performance target values (SKP) highest on the/ruang main Builderand the Builder level I. This reflects that yet the existence of a balancebetween the level SKP value/space. To work behavior employees have metthe standards of good behavior, so planning on aspects of this work is thebehavior maintains the behavior in order to awake with good and consistentover time; On the discipline, the value of the main young Builder/space of91.20, builders of the level I of 91.40, for the Builder of 85.35/space, to thestylist/space level I of 86.81, to the stylist/space of 85.48, for the youngstylist/space level I of 83.56, to the regulator level I/space of 85.33, for theyoung Manager/space level I of 87, and for the young Manager ofspace/81.36.Key Words: Competence, Performance, Compensation, Discipline
Photoreduction of Cr(VI) Catalyzed by TiO2-Lignin Yuniar Yuniar; Endang Tri Wahyuni; Nurul Hidayat Aprilita
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 2, No 1 (2017): February 2017
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v2.i1.22

Abstract

In order to increase  the  activity of TiO2 photocatalyst, preparation and characterization of TiO2-lignin and its activity on Cr(VI) photoreduction have been carried out. TiO2-lignin was prepared by mixing TiO2 powder with lignin powder  in water-ethanol followed by stirring for 24 h and calcination at 400°C. The crystal structure characterizations were performed by X-ray diffraction (XRD), Lignin was identified using FT-IR whereas photoreduction of Cr(VI) was conducted in a batch reactor. The effect of TiO2 content on TiO2-lignin, irradiation time, weight of photocatalyst and initial concentration of Cr(VI) were studied to obtain effectiveness of photoreduction. Activity of TiO2-lignin on the photoreduction of Cr(VI) showed higher result than TiO2. The increased of TiO2 content in TiO2-lignin result in higher Cr(VI) photoreduction and gave maximum yield at mass ratio of TiO2/lignin 2:1. The irradiation time, weight of TiO2-lignin photocatalyst and initial concentration of Cr(VI) obtained for maximum Cr(VI) photoreduction are 40 h, 50 mg and 1 mg/L respectively which reduced Cr(VI) by 81.44%. Keywords: TiO2-lignin, Cr(VI) ion, photoreduction
FOTODEGRADASI SURFAKTAN ANIONIK NATRIUM DODESILBENZENASULFONAT TERKATALISIS TiO2 Normah Ceristrisani; Bambang Rusdiarso; Endang Tri Wahyuni
Prosiding Seminar Nasional MIPA 2012: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2012
Publisher : Prosiding Seminar Nasional MIPA

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Abstract

AbstrakPenghilangan surfaktan anionik berupa natrium dodesilbenzenasulfonat (DBS) yang termasuk dalam golongan Linear Alkilbenzena Sulfonat (LAS), telah dilakukan melalui metode fotodegradasi terkatalisis TiO2. Dalam penelitian tersebut telah dipelajari pengaruh konsentrasi DBS dan waktu penyinaran terhadap efektivitas fotodegradasi DBS yang terkatalisis TiO2.Proses fotodegradasi surfaktan DBS dilakukan dengan cara menyinari campuran yang terdiri dari larutan DBS dan serbuk fotokatalis TiO2 dalam reaktor tertutup yang dilengkapi dengan lampu UV dan disertai pengadukan. Kondisi penelitian fotodegradasi adalah 50 mL larutan DBS dengan konsentrasi awal dan waktu penyinaran yang bervariasi. Hasil fotodegradasi ditentukan berdasarkan selisih konsentrasi DBS awal dengan konsentrasi DBS sisa dalam larutan setelah proses fotodegradasi menggunakan metilen biru melalui metode Spektrofotometri UV-Visibel.Hasil penelitian menunjukkan bahwa penambahan TiO2 dapat meningkatkan efektivitas fotodegradasi surfaktan DBS dari 15,27 % menjadi 98,55 % dari konsentrasi DBS awal 10 ppm. Fotodegradasi DBS terkatalisis TiO2 juga mengalami peningkatan dengan semakin besarnya konsentrasi DBS awal hingga optimum tercapai yaitu pada konsentrsi DBS awal 40 ppm, sebanyak 99,35 % DBS terdegradasi. Waktu penyinaran yang semakin lama dapat meningkatkan efektivitas fotodegradasi surfaktan DBS terkatalisis TiO2 sampai 24 jam dengan hasil degradasi sebesar 98,55 % dan untuk waktu yang lebih lama dapat menyebabkan penurunan efektivitas fotodegradasi.
Effect of Ion Exchanged to the CO2 Adsorption on MFI Zeolites Sang Kompiang Wirawan; I Wayan Warmada; Endang Tri Wahyuni
ASEAN Journal of Chemical Engineering Vol 13, No 2 (2013)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (887.84 KB) | DOI: 10.22146/ajche.49733

Abstract

The adsorption of CO2 on MFI (HZSM-5) and ion exchanged MFI (CaZSM-5) zeolites were studied by a temperature programmed desorption (TPD). The adsorption measurements were conducted at temperatures from 323 to 473 K at atmospheric pressure. The results showed that CO2 was adsorbed on HZSM-5 by one type of adsorption, and on CaZSM-5 zeolites by at least two types of adsorption over the temperature range studied. One was a weak adsorption probably due to interaction with the framework of ZSM-5, and the other was a stronger adsorption caused by interactions with the Ca cations of ZSM-5. The adsorption behavior for HZSM-5 was described by a single site Langmuir adsorption model but for CaZSM-5 a dual site Langmuir model was used. The TPD results indicated that the quantity of irreversibly adsorbed CO2 on HZSM-5 was undetectable.
Co-Authors Ana Hidayati Mukaromah Andari Puji Astuti ANISA NUR KHASANAH Bambang Rusdiarso Eny Winaryati I Wayan Warmada Muhammad Agung Stiarso Muhammad Taufik Hidayat Normah Ceristrisani Nurul Hidayat Aprilita Sang Kompiang Wirawan Sri Riris Septianingsih Wahono . Yuniar Yuniar