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All Journal Journal of Tropical Life Science : International Journal of Theoretical, Experimental, and Applied Life Sciences JURNAL KIMIA SAINS DAN APLIKASI Chem Info WAPFI (Wahana Pendidikan Fisika) Phi : Jurnal Pendidikan Fisika dan Terapan JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Jurnal Penelitian dan Pembelajaran IPA Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Chemistry ORBITA: Jurnal Pendidikan dan Ilmu Fisika JPF : JURNAL PENDIDIKAN FISIKA Molekul: Jurnal Ilmiah Kimia Greensphere: Journal of Environmental Chemistry Journal of Educational Sciences Jurnal Pendidikan MIPA

Parsaoran Siahaan

Department Of Chemistry, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. H. Soedarto, S.H., Tembalang, Semarang 50275, Indonesia

Author-ID : 3962202

Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology Physics Social Sciences Other

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Pengaruh Penggunaan Binder terhadap Densitas dan Kalor Pembakaran Briket dari Limbah Sagu Hendri Widiyandari; Wahyu Setiabudi; Agus Subagio; Sri Haryanti; Parsaoran Siahaan; Heru Tjahjana
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 02 (2013): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i02.1270

Biomass fuel such as briquette is one of an alternative energy regarded to the shortage of the fosil fuel and rising its prices. The byproduct of sago starch industry is the waste that remain the environmental problem because of the odor. However this agricultur waste such as trunk cortex and fibre has a potential application as a raw material for briquette.The fibre and trunk cortex act as matrix material of briquette. The utilizing of sago waste as a biomass briquette and the effect of ratio of matrix/binder to the density, time of compustion and gross heat of the briquette have been elucidated sistematically. The analyzing of gross heat using adiabatic calorimetry indicated that the briquette prepared with the ratio of binder/matrix of 3:4 (mass ratio) had the maximum value of 3929.5 kal/g. The duration of combusion was proposional with density of the briquette.

MOLECULAR INTERACTION BETWEEN BENZONITRILE AND HEXAMETHYLPHOSPHORIC TRIAMIDE BY 13C NMR T1 RELAXATION TIME STUDIES AND AB INITIO QM CALCULATIONS: EXTENDED INVESTIGATION Parsaoran Siahaan; Cynthia L. Radiman; Susanto Imam Rahayu; Muhamad A. Martoprawiro; Dieter Ziessow
Indonesian Journal of Chemistry Vol 9, No 2 (2009)
Publisher : Universitas Gadjah Mada

It has been obtained the anisotropy ratio a = T1(ortho-,meta-13C)/T1(para-13C) of dilute solutions of bn change from 1.7 in fa solution and 1.5 in neat bn to 1.0 in HMPT. Thus the anisotropy ratio comes out to be a = 1. In HMPT, obviously, solvent molecules cluster around Ph-CºN in such a way, that non-covalent interactions lead to isotropic reorientational motion like a spherical molecule. To conform with the T1 times, a layer arrangement with at least two HMPT molecules per Ph-CºN seems to be likely. From computational quantum calculations of non-covalent intermolecular interactions and Mie potential analysis, the solute-solvent molecular pairs in bnּּּHMPT have almost equal interaction energies for the ortho, meta, and para configuration and the layered configurations are energetically permitted

INVESTIGATION OF MOLECULAR INTERACTION BETWEEN PHENYLACETYLENE AND HEXAMETHYLPHOSPHORIC TRIAMIDE BY 13C NMR T1 RELAXATION TIME STUDIES AND AB INITIO QM CALCULATIONS Parsaoran Siahaan; Cynthia L. Radiman; Susanto Imam Rahayu; Muhamad A. Martoprawiro; Dieter Ziessow
Indonesian Journal of Chemistry Vol 7, No 3 (2007)
Publisher : Universitas Gadjah Mada

Intermolecular interactions and molecular translational and rotational mobility are key factors in molecular material sciences, e.g. liquid crystals. One of the important substructures is given by phenylacetylene, Ph-CºCH. Its rotational behavior in its pure form and in high dilution in hexamethylphosphoric triamide OP[N(CH3)2]3 (HMPA) has been studied by means 13C NMR T1 relaxation times at ambient temperature as measured by the inversion recovery method. HMPA is an exceptional solvent in that is has a quite large dipole moment but comparatively low relative dielectricity constant. From the molecular shape Ph-CºCH is expected to exhibit anisotropic rotational diffusion which in fact can be deduced from the measured set of T1 values of the ortho, meta and para carbon nuclei in the neat liquid as well as in the HMPA solution. This expected result rules the dominance of a linearly molecules pair Ph-CºCH...HMPA along their dipole moment axes as anticipated in view of the large HMPA dipole moment. In order to conform with the T1 data, a linear arrangement of Ph-CºCH via the interaction between its weakly acidic H-atom with negatively charge O-atom of HMPA molecules seems to lead to such an anisotropic rotational motion. This hypothesis is supported by ab initio QM calculations which come out with higher interaction energy for linear orientation than other geometries. These ab initio calculations were performed with the basis set of RHF/6-31G(d) for the single molecules of Ph-CºCH and HMPA as well as for their various geometries of the molecules pair. Molecular dynamics simulations need to be performed for further confirmation.

The Optimum Conditions of Carboxymethyl Chitosan Synthesis on Drug Delivery Application and Its Release of Kinetics Study Parsaoran Siahaan; Nadira Cahyaning Mentari; Ustera Octovindra Wiedyanto; Dwi Hudiyanti; Suci Zulaikha Hildayani; Marlyn Dian Laksitorini
Indonesian Journal of Chemistry Vol 17, No 2 (2017)
Publisher : Universitas Gadjah Mada

In this paper, carboxymethyl chitosan (CMC) was synthesized and studied as a carrier to encapsulate vitamin (as drug model) and controlled release. Chitosan (CS) is a polycationic derivated from chitin, which suitable for active substance carrier system on biomedical function. CS has good properties such as non-toxic, biodegradable, and biocompatible. However, CS insoluble in an aqueous solvent so CS was modified chemically into CMC. CMC was formed by reacting CS and monochloroacetic acid with sodium hydroxide (NaOH) as a catalyst. Optimation was performed by varying the NaOH concentration during alkalizing the CS and the temperature reaction. The functional group and crystallinity of CS and CMC were estimated by FTIR and XRD. The degree substitution of carboxymethylation has an average value of 0.60. The results show optimum temperature reaction and NaOH concentration were 60 °C and 40% (w/v). The nicotinamide (NA), a hydrophilic vitamin, was loaded within CMC matrix system through in vitro precipitation method. To confirm the encapsulation of NA in CMC and the release kinetics of NA from CMC in distilled water was studied through UV-Vis spectrophotometry. The release profile of NA from CMC matrix system carried out for 3 h and 12 h. The rate of NA release from CMC increases with increasing time and the follows a zero order, Higuchi, and Korsmeyer-Peppas kinetics rules.

The Effect of Temperature, Sulfonation, and PEG Addition on Physicochemical Characteristics of PVDF Membranes and Its Application on Hemodialysis Membrane Retno Ariadi Lusiana; Ayub Indra; Nor Basid Adiwibawa Prasetya; Nurwarrohman Andre Sasongko; Parsaoran Siahaan; Choiril Azmiyawati; Nanik Wijayanti; Anugrah Ricky Wijaya; Mohd Hafiz Dzarfan Othman
Indonesian Journal of Chemistry Vol 21, No 4 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.63740

Polyvinylidene fluoride (PVDF) membrane and its derivative have been investigated the permeation ability for creatinine and urea. The membrane was made by an inversion precipitation system in N,N-dimethyl acetamide (DMAc) and water as non-solvents. In this study, the modification of PVDF membrane permeability with PEG additives, CBT variations, and sulfonation was successfully carried out. The membrane solidification process was carried out on three variations of the coagulation bath temperature (CBT): 30, 45, and 60 °C. Eight types of membranes were characterized by using FT-IR and TGA/DSC, followed by the analysis of their porosity, hydrophilicity, water uptake, swelling degree, tensile strength, and permeability of creatinine and urea. The FT-IR spectra indicate that PVDF modification has been successfully carried out. The porosity, hydrophilicity, water uptake, and swelling degree values increase with the modification of functional groups. Furthermore, improvements in creatinine and urea permeability and clearances are achieved by increasing CBT and sulfonation in the PVDF/PEG membrane. The presence of sulfonate groups improves the membrane permeability through the interaction of intermolecular hydrogen with water and dialysate compounds. The existence of PEG as a porogen enhanced membrane porosity. Creatinine and urea clearance values increase from 0.29–0.58 and 6.38–20.63 mg/dL, respectively.

Computational Evaluation of Intermolecular Interaction in Poly(Styrene-Maleic Acid)-Water Complexes Using Density Functional Theory Daru Seto Bagus Anugrah; Laura Virdy Darmalim; Permono Adi Putro; Liana Dewi Nuratikah; Nurwarrohman Andre Sasongko; Parsaoran Siahaan; Adi Yulandi
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.67961

The high application of Poly(styrene-maleic acid) (PSMA) in an aqueous environment, such as biomedical purposes, makes the interaction between PSMA and water molecules interesting to be investigated. This study evaluated the conformation, the hydrogen bond network, and the stabilities of all the possible intermolecular interactions between PSMA with water (PSMA−(H2O)n, n = 1–5). All calculations were executed using the density functional theory (DFT) method at B3LYP functional and the 6–311G** basis set. The energy interaction of PSMA–(H2O)5 complex was –56.66 kcal/mol, which is classified as high hydrogen bond interaction. The Highest Occupied Molecular Orbital (HOMO) – Lowest Unoccupied Molecular Orbital (LUMO) energy gap decreased with the rise in the number of H2O molecules, representing a more reactive complex. The strongest hydrogen bonding in PSMA–(H2O)5 wasformed through the interaction on O72···O17–H49 with stabilizing energy of 50.32 kcal/mol, that analyzed by natural bond orbital (NBO) theory. The quantum theory atoms in molecules (QTAIM) analysis showed that the hydrogen bonding (EHB) value on O72···O17–H49 was –14.95 kcal/mol. All computational data revealed that PSMA had moderate to high interaction with water molecules that indicated the water molecules were easily transported and kept in the PSMA matrix.

Silica Magnetite Adsorbent: Effect of Drying Temperature of Silica Sol Gel on Magnetite Core Structure Endang Sawitri; Choiril Azmiyawati; Parsaoran Siahaan
Jurnal Kimia Sains dan Aplikasi Vol 21, No 3 (2018): Volume 21 Issue 3 Year 2018
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Recently, magnetite was investigated as water purification adsorbent because it’s unique magnetic properties that improved the adsorption efficiency through desorption process. But magnetite oxidized into maghemite/hematite with the increase of temperature. This transformation should be avoided to maintain the magnetic properties of magnetite. In this research magnetite separated from iron sand by magnetic extraction then coated with silica via sol gel method. The effect of drying temperature in sol gel had change the magnetite core structure into maghemite and found no formation of hematite at 350⁰C. Silica coating proved had protected magnetite from transformation into hematite due to drying temperature until 350⁰C .

Perbandingan Profil Hakikat Sains pada Buku Teks IPA SMP Indonesia, Malaysia, dan Singapura: Kasus Materi Kelistrikan Putra Habib Dhitareka; Arif Hidayat; Parsaoran Siahaan
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 5 (2022): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i5.1878

Nature of Science is a significant element in science education, especially for the linkages to scientific literacy. As one of an educational support for both teachers and students, textbooks become crucial for teaching and learning. Textbooks may elicit NOS understanding for students and guide teacher to deliver NOS understanding. The way to make better process and outcome, integration of NOS into the textbooks comprehensively is crucial. To get a better understanding of NOS within the diverse framework, an inclusive framework is needed to get better understanding, thus, Family Resemblance Approach is chosen. This study aims to identify the profile of NOS integration and NOS quality in secondary science textbooks by comparing different textbook from three neighboring countries (Indonesia, Malaysia, and Singapore). Descriptive research design with content analysis method conducted to identify the documents using the Family Resemblance Approach to NOS as the analytical framework. The results show that Indonesian textbooks presenting most abundance of NOS, but contain most materials delivered and the quality is mainly at low level. Malaysian textbooks contain the least representation but contain well proportion for the quality and materials presented. Singapore textbooks is least materials with abundance of NOS and consist of high-level quality of NOS. This may lead the conformity of the significance of textbooks elicited students understanding of NOS

Structural Stability of ADTC5 Peptide: Conformational Insights into Dynamics and Its Binding Mode Parsaoran Siahaan; Vivitri Dewi Prasasty; Bungaran David Simanjuntak; Suci Hildayani; Khairul Anam
Journal of Tropical Life Science Vol. 7 No. 2 (2017)
Publisher : Journal of Tropical Life Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jtls.07.02.09

The cyclic structure of ADTC5 (Ac-CDTPPVC-NH2) peptide is known has ability to modulate homo dimer E-cadherin interactions to form adherens junction at the intercellular junction.Â The ability to inhibit E-cadherin interaction has become important to increase paracellular porosity in delivering drug molecules to the target cell. There are two types of ADTC5 state: opened-cyclic state (OCS) and closed-cyclic state (CCS). OCS of ADTC5 is affected by distance constraint and CCS is formed by disulfide bond from terminal cysteines through force restraint. The aim of this research is to investigate the inhibition activity of ADTC5 peptide upon E-cadherin. Here we used molecular docking and molecular dynamics approaches. The structure of ADTC5 peptide was generated by PyMOL program. GROMACS v4.5.5 was utilized to simulate molecular dynamics. The optimized ADTC5 molecule was placed in aqueous or polar condition at physiological pH. Furthermore, ADTC5 was docked with EC1-EC2 coupled domain of E-cadherin using AutoDock 4.2 and be refined using molecular dynamic (MD). The result showed that CCS ADTC5 peptide has stronger affinity and more stable interaction with EC1-EC2 coupled domain than the OCS one.

PENGEMBANGAN INSTRUMEN FOUR-TIER DIAGNOSTIC TEST UNTUK MENDETEKSI MISKONSEPSI SISWA KELAS X PADA MATERI IMPULS Fungky Iqlima Nasyidiah; Parsaoran Siahaan; Dedi Sasmita
WaPFi (Wahana Pendidikan Fisika) Vol 5, No 2 (2020): WaPFi (Wahana Pendidikan Fisika) 2020
Publisher : Universitas Pendidikan Indonesia (UPI)

ABSTRAK Miskonsepsi merupakan satu dari permasalahan yang dialami siswa pada proses pembelajaran terutama ketika mereka belajar di sekolah. Materi Impuls adalah satu dari konsep abstrak dalam ilmu fisika, lebih tepatnya pada bagian mekanika. Impuls menjadi sulit dipahami ketika diimplementasikan pembelajaran konvensional dan sangat jarang penelitian yang mengungkap miskonsepsi siswa pada materi impuls. Maka dari itu, penelitian ini bertujuan mengembangkan Instrumen Four-Tier Diagnostic Test untuk mengungkap miskonsepsi siswa pada materi impuls. Penelitian ini menggunakan desain penelitian yaitu 3D+1I (defining, designing, developing, dan implementing). Four-Tier Diagnostic Test terdiri dari empat tingkatan, yaitu tingkat pertama berisi pertanyaan dengan empat pilihan jawaban tertutup dan satu pilihan jawaban terbuka, tingkat kedua berisi tingkat keyakinan menjawab pada tier pertama, tingkat ketiga berisi beberapa pilihan alasan tertutup dan satu pilihan alasan terbuka, dan tingkat keempat berisi tingkat keyakinan dalam memilih pilihan alasan. Subjek penelitian ialah siswa kelas X di SMA Kota Bandung. Pengujian validitas Four-Tier Diagnostic Test oleh validator menunjukkan valid. Reliabilitas Instrumen Four-Tier Diagnostic Test menunjukan konsistensi jawaban dari siswa lemah, namun kualitas butir-butir soal dalam instrument aspek realibilitasnya bagus. Soal tes memiliki 6 soal sukar, 2 soal mudah dan 2 soal sangat mudah. Serta untuk daya pembeda soal tes memiliki 5 soal sangat baik, 2 soal baik, 2 soal kurang baik dan 1 soal jelek. Walau begitu soal tetap dapat diterima karena tidak ada nilai yang menunjukkan nilai negatif. Terdapat 58% siswa terkategori partial negative pada nomor soal 10 dan 13% siswa terkategori miskonsepsi pada nomor soal 2 dan 10. Kata Kunci: Four-Tier Diagnostic Test , Impuls, Miskonsepsi, dan Model Rasch ABSTRACT Misconception is one of the problems experienced by students in the learning process, especially when study at school. Impulse is one of the abstract concepts in physics, especially mechanics section. Impulses become difficult to understand when conventional learning is implemented and very rarely research that reveals students' misconceptions on impulse material. Therefore, this study aims to develop a Four-Tier Diagnostic Test Instrument to reveal students' misconceptions on impulse material. This study used a research design, namely 3D + 1I (defining, designing, developing, and implementing). The Four-Tier Diagnostic Test consists of four levels, namely the first level contains questions with four closed answer options and one open answer option, the second level contains the confidence level of answering in the first tier, the third level contains several closed reasons and one open choice of reasons, and the fourth level contains the level of confidence in choosing the choice of reason. The research subjects were students of class X in SMA Bandung City. The validity test of the Four-Tier Diagnostic Test by the validator shows that it is valid. The reliability of the Four-Tier Diagnostic Test instrument shows the consistency of the answers from students is weak, but the quality of the items in the instrument's reliability aspect is good. The test questions have 6 difficult questions, 2 easy questions and 2 very easy questions. As well as for distinguishing power the test questions have 5 very good questions, 2 good questions, 2 bad questions and 1 bad question. Even so, the problem can still be accepted because there is no value that shows a negative value. There were 58% of students categorized as partial negative in question numbers 10 and 13% of students categorized as misconceptions in question numbers 2 and 10. Keyword: Four-Tier Diagnostic Test , Impulse, Miconceptions, dan Rasch Model.

Co-Authors A. Suhandi A.F.C Wijaya A.F.C. Wijaya Achmad Samsudin Ade Rahmani ADI YULANDI Agus Subagio Amsor, Amsor Anam, M. Khairul Anggi Hanif Setyadin Anugrah Ricky Wijaya Anugrah, Daru Seto Bagus ARIF HIDAYAT Asep Saefullah Atiatul Manna Ayub Indra Badri Rahmatulloh Bambang Cahyono Bani Amanullah Prasojo Bungaran David Simanjuntak Choiril Azmiyawati Cynthia L. Radiman Cynthia L. Radiman Desita Triana Dieter Ziessow Dieter Ziessow Diky Yopianto Dwi Hudiyanti Dwi Hudiyanti E. Suhendi Efendi, Ridwan Eka Liandari Endang Sawitri Endi Suhendi Ermawati Dewi Ermawati Dewi, Ermawati Farach, Nurul Febriani Sinambela Friska, Reski Ivon Fungky Iqlima Nasyidiah Gadis Argi Kiranti Hendri Widiyandari Heni Rusnayati Heny Ekawati Haryono Hildayani, Suci I Gusti Bagus Wiksuana Ida Kaniawati Ika Mustika Sari Imelda F. Saragih Isnaini Isnaini Isnaini Isnaini Khafidhoh Nurul Aini, Khafidhoh Nurul Khairul Anam KL Putri Laura Virdy Darmalim Liana Dewi Nuratikah Marchelia Dwi Yanthi Marlyn Dian Laksitorini Marlyn Dian Laksitorini Marta J. Sipangkar Mohd Hafiz Dzarfan Othman Mr Sumar Hendayana Muhamad A. Martoprawiro Muhamad A. Martoprawiro Muhammad Cholid Djunaidi Nadira Cahyaning Mentari Nanik Wijayanti Nastiti Nastiti Nia Kurniasih Nor Basid Adiwibawa Prasetya Nurbani, Anggita Repsi Nurwarrohman Andre Sasongko Parlindungan Sinaga Permono Adi Putro Purwanto, Purwanto Putra Habib Dhitareka Redemtus Heru Tjahjana Restina Septiani Retno Ariadi Lusiana Rikno Budiyanto Risda Destari Royhanshah, Moch Freskha Fauzi Sasmita, Dedi Sekar Kusuma Dewi Simanjuntak, Bungaran David Sri Haryanti Suci Hildayani Suci Zulaikha Hildayani Suhartana Suhartana Susanto Imam Rahayu Susanto Imam Rahayu Tantri Nevi Astuti Taufik Rahman Tri Endro Pranowo Tri Windarti Unang Purwana Ustera Octovindra Wiedyanto Vina Rilantinawati Vivitri Dewi Prasasty Wahyu Setiabudi Wawan Setiawan Wempie Gressangga Yanthi, Marchelia Dwi Yenni, Rozi Prima Yunina Surtiana

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