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All Journal VALENSI Cakrawala Pendidikan Jurnal Kependidikan: Penelitian Inovasi Pembelajaran JPMS (Jurnal Pendidikan Matematika dan Sains) Jurnal Penelitian Saintek Jurnal Inovasi Pendidikan Jurnal Sains Dasar Jurnal Inovasi Pendidikan IPA Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Indonesian Journal on Learning and Advanced Education (IJOLAE) Molekul: Jurnal Ilmiah Kimia Jurnal Eduscience (JES) Jurnal Paedagogy Indonesian Journal of Chemistry and Environment SAINSTECH: Jurnal Penelitian dan Pengkajian Sains dan Teknologi Jurnal Elemen Kimia Jurnal Riset Pembelajaran Kimia Jurnal Pendidikan MIPA

Endang Widjajanti Laksono FX

Universitas Negeri Yogyakarta

Author-ID : 3008128

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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SYNTHESIS AND CARATERIZATION OF SNO2 AS A DEVELOPMENT EFFORTS WHITE TIN PRODUCTS TO IMPROVE NATIONAL DEVISES Anti Kolonial Prodjosantoso; Endang Widjajanti Laksono; M. Pranjoto Utomo
Jurnal Penelitian Saintek Vol 16, No 2: Oktober 2011
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Long-term goal of this research is to apply nanotechnology in the development of downstream products of tin to increase the national foreign exchange. As a preliminary study, SnO2 was synthesized by dissolving tin metal in concentrated HCl followed by addition of concentrated NH4OH in dropwise. The precipitate was filtered, dried, and partially characterized using IR spectrophotometer FTIR-8300/8700 model in the range of wave number of 400 cm-1 to 4000 cm-1, whilst the rest was then heated in a furnace at temperature about 900 °C for 4 hours. The oxide was then cooled and characterized by using XRD Zhimadsu S6000 diffractometer using monochromatic Cu KĮ radiation with a wavelength (Ȝ) of 1.5406 Å in the 2ș range 5o to 90o , and scanning electron microscope (SEM) JEOL T330 A operating at 15 keV. The crystallography aspects of SnO2 was studied based on the X-ray diffraction data (XRD) which was analyzed with Rietveld method using the WinPLOTR program. The SnO2 oxide was found to be tetragonal P42/mnm space group having lattice parameters of a = b = 4.7337(2) ǖ and c = 3.1841(3) ǖ. The particle size of the SnO2 oxide was found to be about 35.39 nm.

Kinetics and Thermodynamics Studies of Copper(II) Adsorption onto Activated Carbon Prepared from Salacca zalacca Peel Dewi Yuanita Lestari; Endang Widjajanti Laksono
Molekul Vol 15, No 2 (2020)
Publisher : Universitas Jenderal Soedirman

Highly porous and stable materials, such as alumina, silica, carbon, zeolite, and bentonite, are well known and have been used as metal ion adsorbents. However, the use of biogenic carbon as adsorbent is relatively rare. The adsorption of copper(II) onto activated carbon extracted from Salcaca zalacca peel was studied. The effect of initial copper concentration, contact time, and a series temperature was studied. Adsorption was carried out in a batch technique. The adsorption equilibrium was reached after 60 minutes of contact time. The adsorption data had a better fitting line for the Langmuir isotherm model. The Langergren and also Ho and Mc Kay equations were used to predict the adsorption kinetics. The adsorption process obeyed a second-order kinetics model. The Thermodynamic parameters were ∆H°= -42.4180 kJ/mol; ∆S°= -0.0843 kJ/mol; ∆G°<0. These values indicated that the adsorption was exothermic and spontaneous. The low ∆G° value revealed that the main mechanism controlling the adsorption process was physisorption.

PENGGUNAAN LUMPUR AKTIF SEBAGAI MATERIAL UNTUK BIOSORPSI PEWARNA REMAZOL Dewi Yuanita; Endang Widjajanti; Sulistyani Sulistyani
Molekul Vol 9, No 2 (2014)
Publisher : Universitas Jenderal Soedirman

Penelitian ini bertujuan untuk mengetahui massa biosorben optimum, waktu kontak optimum dan konsentrasi pewarna optimum dalam biosorpsi lumpur aktif terhadap pewarna remazol teknis serta mengetahui pengaruh proses biosorpsi terhadap kadar COD (Chemical Oxygen Demand) pewarna remazol teknis. Proses biosorpsi dilakukan dengan sistem batch pada berbagai variasi massa biosorben, waktu kontak dan konsentrasi pewarna remazol teknis. Larutan pewarna remazol teknis sebelum dan sesudah biosorpsi dianalisis secara kuantitatif dengan spektrofotometer UV-Vis. Penentuan kadar COD dilakukan pada larutan remazol teknis sebelum dan sesudah adsorpsi. Efisiensi biosorpsi dinyatakan dalam bentuk konsentrasi teradsorpsi dibagi konsentrasi mula-mula larutan dan dikalikan 100%. Hasil penelitian menunjukkan bahwa: massa lumpur aktif yang memberikan efisiensi terbesar pada biosorpsi remazol blue yaitu 5 gram dengan efisiensi biosorpsi 6,83% sedangkan untuk remazol red adalah 150 gram dengan efisiensi biosorpsi 67,19%. Waktu optimum dalam biosorpsi remazol blue menggunakan lumpur aktif adalah 15 menit dengan efisiensi biosorpsi 7,98%, sedangkan untuk remazol red adalah 75 menit dengan efisiensi biosorpsi 9,30%. Konsentrasi optimum dalam biosorpsi remazol blue menggunakan lumpur aktif adalah 200 ppm dengan efisiensi biosorpsi 6,19% dan untuk remazol red 600 ppm dengan efisiensi biosorpsi 9,10%. Kadar COD pewarna remazol blue mengalami penurunan sebesar 22,22% setelah proses biosorpsi dengan lumpur aktif.

Pengembangan Lembar Kerja Peserta Didik (LKPD) berbasis Literasi Konten Kearifan Lokal pada Materi Asam dan Basa Kelas XI SMA Febri Saputri; Endang Widjajanti L.F.X.
Jurnal Pendidikan Matematika dan Sains Vol 10, No 2 (2022): December 2022
Publisher : Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpms.v10i2.42374

Penelitian pengembangan ini dilakukan dengan tujuan: (1) menghasilkan produk lembar kerja peserta didik (LKPD) materi asam basa yang mengacu pada model pembelajaran student team achievement divission (STAD) berbasis literasi konten kearifan lokal sesuai dengan kekhasan yang dibuat; (2) mengetahui kelayakan LKPD yang dihasilkan berdasarkan penilaian lima guru kimia SMA; (3) mengetahui respon peserta didik terhadap produk melalui uji keterbacaan oleh peserta didik. Prosedur pengembangan mengacu pada model pengembangan 4D. Tahap yang dilakukan antara lain: (1) Define (pendefinisian); (2) Design (perancangan); (3) Development (pengembangan); (4) Disseminate (penyebaran). Hasil validasi oleh dosen ahli pembelajaran kimia LKPD ini layak digunakan setelah direvisi berdasarkan saran penilai. Hasil penilaian kualitas produk LKPD oleh reviewer memperoleh persentase keidealan 88,00% dan hasil uji keterbacaan oleh peserta didik memperoleh persentase keidealan sebesar 83,31%, sehingga secara keseluruhan LKPD ini layak digunakan pada pembelajaran kimia.

Kinerja Lalu Lintas Simpang Tak Bersinyal Perkotaan pada Lahan Terbatas (Studi Kasus : Simpang Jl. M. Kahfi II – Jl. Srengseng Sawah, Jakarta Selatan) Endang Widjajanti; Wileri Mandabi; Lely Mustika
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 32 No 4 (2022): Sainstech : Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37277/stch.v32i4.1470

Abstract This study aims to determine the performance of the unsignalized intersection Jl. M. Kahfi II – Jl. Srengseng Sawah, South Jakarta. The analysis of the performance at unsignaled intersections refers to the guideline of the Indonesian Road Capacity Manual (MKJI), 1997. Data obtained through field surveys include geometric conditions, environmental conditions, and traffic conditions. The results of the analysis show that the peak hours of the working day in the morning period occur at 06.30 – 07.30 with a degree of saturation (DS) 1.10 with an intersection delay (D) of 25.16 sec/pcu and the afternoon period occurs at 18.00 – 19.00 with a degree of Saturation (DS) 0.93 with Intersection Delay (D) 16.39 sec/pcu. The results of the analysis for holidays show that the peak hours of the morning holiday period occur at 08.00 – 09.00 with a Degree of Saturation (DS) 0.71 with a Intersection Delay (D) 11.74 sec/pcu and the afternoon period occurs at 16.45 – 17.45 with a degree of saturation (DS) 0.85 with an intersection delay (D) of 14.31 sec/pcu. The results of this analysis indicate that the performance of the unsignalized intersection on Jl. M. Kahfi II – Jl. Srengseng Sawah South Jakarta is already in bad condition on weekdays and not good on holidays.. Increasing the capacity of Jalan Kahfi II in accordance with detailed spatial plans and zoning regulations in the Jagakarsa District, South Jakarta City in 2014, namely an increase in Jl. Kahfi II from Road Type 2/2 UD to 4/2D is very urgent to apply Keywords: traffic performance, urban, unsignalized intersection

Pengembangan Instrumen Penilaian Terintegrasi untuk Mengukur Keterampilan Berpikir Analitis dan Sikap Ilmiah siswa pada materi kesetimbangan Kimia Lalu Busyairi Muhsin; Endang Widjajanti Laksono
Jurnal Penelitian Pendidikan IPA Vol 9 No 2 (2023): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i2.2191

Technological advances which are the parameters of the new era have an impact on the demands for increasing skills. The current demand for skills is in the form of 21st century skills, including analytical thinking skills. In addition, scientific attitudes are part of the science elements that are required to be mastered by students in this century, therefore it is necessary to have an instrument that can measure these two skills, based of this, an integrated assessment instrument is developed which aims to determine the characteristics of the instrument, the feasibility and the results of the measurement of an integrated assessment of students' analytical thinking skills and scientific attitudes on chemical equilibrium material for 11th grade of senior high school. All test subjects came from six schools in the city of Mataram, West Nusa Tenggara province. Sample take by stratified random sampling technique. The test results were analyzed using the Partial Credit Model 1 Parameter-Logistic (PCM 1-PL) approach in Item Response Theory (IRT) by the Winsteps program. All items were declared fit. The measurement results using this integrated assessment instrument show that students' analytical thinking skills and scientific attitudes on chemical equilibrium material are 36.5% in the moderate category

SYNTHESIS CELLULOSE MEMBRANE- CINNAMON OIL FOR FOOD PRESERVATIVE SINTESIS MEMBRAN SELULOSA- MINYAK KAYU MANIS UNTUK PENGEMAS PANGAN endang widjajanti laksono
Jurnal Penelitian Saintek Vol 28, No 1 (2023)
Publisher : Directorate of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.58334

Tujuan penelitian ini adalah untuk mengetahui pengaruh penambahan gliserol dan minyak kayu manis terhadap sifat mekanik film selulosa yaitu kekuatan tarik, persen elongasi, dan modulus young. Metode yang digunakan yaitu metode coating. Perbandingan konsentrasi gliserol dan minyak kayu manis yang digunakan dalam pembuatan film selulosa adalah 3:1; 5;1; 7:1; dan 10:1. Hasil penelitian menunjukkan bahwa penambahan gliserol dan minyak kayu manis berpengaruh terhadap sifat mekanik yang dihasilkan. Variasi penambahan gliserol dan minyak kayu manis yang paling baik adalah pada perbandingan 3:1 dengan nilai kuat tarik 14,2181 MPa, elongasi 21,3843%, dan modulus young 66,4602%.

Synthesis of Film Cellulose-Glycerol-Cloves Oil as Chili Packaging Endang Widjajanti Laksono; Putri Nur Halimah
Indonesian Journal of Chemistry and Environment Vol 6, No 1 (2023): JUNE 2023
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijoce.v6i1.61502

The aim of this research is to know the utilization of cellulose film with the addition of glycerol and clove oil in various variations as the best chilli packer based on mechanical properties, surface photo, water resistance test, and its effectiveness to extend the life of chilli. The production of cellulose film as packaging in this research is done by using coating method. In the coating method, variations of glycerol and clove oil were added in the ratio of (3: 1), (5: 1), (7: 1), (10: 1), and (15: 1) (v / v). The synthesized cellulose film will be characterized by functional group analysis using FTIR-ATR, mechanical test using Tensile strength, surface photo using optical microscope, cellulose film resistance test to water, and effectiveness test as chili packaging. FS Gli: Ck (3: 1) is a cellulose film with variations in the addition of glycerol and the best clove oil which has a tensile strength of 12.193 MPa, elongation of 9.761%, the most homogeneous surface photo, the greatest water resistance value 42,87, and effectiveness best cellulose film as a chilli packer.

Analisis Sistem Pengambilan Keputusan Penentuan Konstruksi Jalan dengan Perkerasan Kaku atau Fleksibel (Studi Kasus Jalan di Propinsi Maluku Utara) Rivolino Merbas; Endang Widjajanti; Syahril Taufik
SAINSTECH: JURNAL PENELITIAN DAN PENGKAJIAN SAINS DAN TEKNOLOGI Vol 33 No 1 (2023): Sainstech: Jurnal Penelitian dan Pengkajian Sains dan Teknologi
Publisher : Institut Sains dan Teknologi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37277/stch.v33i1.1650

ABSTRACT This research discussing about decision support system analysis in determining concrete and composit road construction compared to asphalt construction for the case of roads in North Maluku Province. This study uses the Analytic Hierarchy Process (AHP) method or model as a method to analyze the feasibility of concrete and composit construction compared to asphalt construction. There are at least 7 (seven) factors that are considered as AHP inputs, namely road conditions, technical pavement, ecomonical/cost, duration/method of construction, availability of equipment, environmental conditions, and availability of materials. This study method includes data collection and analysis methods. For data collection, this study uses a questionnaire method that contains questions related to technical and non-technical factors that are used to assess the feasibility of a road for selecting a type of road pavement with flexible or rigid pavement. The construction feasibility of concrete and composite pavements is better than that of flexible asphalt pavements on road constructions, with the following sub-criteria conditions; roads that have bends and inclines, lower road maintenance costs, excellent weather and environmental resistance, less dense traffic, easy work execution and can be done at any time, do not require a lot of AMP and equipment, and asphalt availability can't fast time. The alternative of road pavement type is effective as a weight value of 33.78% with using the composite pavement construction. Keywords: Roadworthiness, Composite pavement, AHP, Decision Support System, North Maluku

POLA ISOTERM ADSORPSI ION TEMBAGA(II)OLEH KULIT SALAK TERMODIFIKASI Putri Utha Cahyaningrum; Endang Widjajanti, LFX; Dewi Yuanita Lestari
Jurnal Elemen Kimia Vol 5, No 6 (2016): Volume 5,No 6 Edisi 6 Tahun 2016
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Penelitian ini bertujuan untuk menentukan waktu kontakadsorpsi ion tembaga(II) oleh kulit salak termodifikasi pada saatsetimbang dan pola isotermnya.Kulit salak didelignifikasi menggunakan larutan NaOH 1M selama 12 jam, kemudian diaktivasi dengan asam sulfat 1 Mselama 24 jam.Karakterisasi adsorben dilakukan menggunakanFTIR. Daya adsorpsi ditentukan dengan membandingkankonsentrasi Cu(II) sebelum dan sesudah adsorpsi. Sedangkankonsentrasi Cu(II) ditentukan menggunakan spektrofotometerserapan atom pada panjang gelombang 324,75 nm. Penentuanwaktu adsorpsi saat setimbang dilakukan dengan merendamkulit salak termodifikasi dalam larutan Cu(II) denganperbandingan 1:100 (b/v) untuk berbagai variasi. Sedangkanpola isoterm adsorpsi ditentukan menggunakan data dayaadsorpsi pada variasi konsentrasi awal Cu(II) dengan waktukontak setimbang,selanjutnya data diplot pada persamaanisoterm Langmuir dan Freundlich.Hasil penelitian memperlihatkan bahwa waktu kontakpada adsorpsi Cu(II) oleh adsorben kulit salak termodifikasi saatsetimbang adalah 60 menit dan mengikuti pola isotermLangmuir

Co-Authors A.K Prodjosantoso A.K Prodjosantoso Afikah, Adilah Amalia, Puspita Andi Wibowo Anjamampionona Notiavina, Andriandrainiarimanana Anna Rakhmawati APRILIANA, APRILIANA Apriliyani Dwi Iriyanti Ariefiani, Nurlaila Widyanarti Desfi Annisa Desfi Annisa Desfi Annisa, Desfi Deti Suwanti Dewi Yuanita Dewi Yuanita Dewi Yuanita Lestari Dewi Yuanita Lestari Eli Rohaeti Fajarisma Izzatul Nadia Febri Saputri Goni, Nur Abdul Habibil Mazid Hari Sutrisno Inviolata, Lusia Isana Supiah Yosephine Louise Joronavalona, Rasamimanana K.H. Sugiyarto, K.H. Kun Sri Budiasih Kuntadi Kuntadi Latifah Rachmalia M. Pranjoto Utomo Marfuatun ' Marfuatun Marfuatun Marfuatun, Marfuatun Masriat, Ester Muhsin, Lalu Busyairi Mustika, Lely Nur Syarifah Sukarno Pratama, Faiz Ilham Putri Nur Halimah Putri Utha Cahyaningrum Regina Tutik Padmaningrum Rivolino Merbas SAPUTRI, FEBRI Situmorang, Suryani S Sri Novita Yanda Sukisman Purtadi Sulistyani Sulistyani Sulistyani Sulistyani Suwardi Suwardi Suwardi Suwardi Suyanta Suyanta Syahril Taufik Tafani, Tafani Wijayanti Wijayanti Wileri Mandabi Yanda, Sri Novita

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