bluuebunny/crossref_metadata_2025 huggingface dataset:
Analisis Ukuran Teras dan Rasio H/D pada Molten Salt Fast Reactor dalam Tinjauan Neutronik
Authors: Azurah Puti Berkah , Fitriyani Dian , Permana Sidik
Published: March 2022

Telah dilakukan simulasi pada Molten Salt Fast Reactor (MSFR) berdaya 100 MWth untuk menganalisis pengaruh bentuk dan ukuran teras terhadap kinerja neutronik. Penelitian ini menggunakan kode komputasi SRAC (Standard Thermal Reactor Analysis Code System) yang dikembangkan oleh JAEA (Japan Atomic Energy Agency). Analisis dilakukan terhadap 9 variasi bentuk dan ukuran teras pada teras MSFR silinder dua dimensi (2-D) dengan peninjauan terhadap parameter neutronik yaitu faktor multiplikasi efektif,. Perhitungan neutronik dilakukan dengan mengatur komposisi bahan bakar dalam teras. Hasil perhitungan menunjukkan bahwa seluruh variasi model teras menghasilkan nilai faktor multiplikasi efektif di atas 1,0 pada awal masa operasi reaktor. Model teras C1 (volume teras 6 m3, bentuk teras tall) merupakan model teras yang paling baik dalam mempertahankan kekritisan reaktor dengan reactivity swing sebesar 0,0721.Â A simulation of 100 MWth Molten Salt Fast Reactor (MSFR) has been carried out to analyze the influence of core shape and size to its neutronic performance. This research used computational code SRAC (Standard Thermal Reactor Analysis Code System) developed by JAEA (Japan Atomic Energy Agency). Analysis has been done to 9 variation of core shape and size on two-dimensional (2-D) cylinder ofÂ  MSFR in terms of neutronic parameter such as the effective multiplication factor with arrangement of fuel composition. The neutronic calculation shows that all of core type bring out the value of effective multiplication factor above 1,0Â  in the beginning of reactor operation. C1 is the most optimum core model because it can maintain the criticality of the core reactor with reactivity swing value of 0,0721.
Pengaruh Waktu Annealing Lapisan Tipis ZnO Terhadap Efisiensi Sel Surya Dye Sensitized Solar Cells (DSSC)
Authors: Yozu Genta El Haqqi , Dahlan Dahyunir
Published: March 2022

Telah diteliti pengaruh lama annealing lapisan tipis ZnO terhadap efisiensi Dye Sensitized Solar Cells. Lapisan ZnO yang ditumbuhkan kemudian di-annealing menggunakan furnace. Annealing dilakukan pada temperatur 450o C denganÂ  durasi 1 - 5 jam.Â  Lapisan ZnO yang terbentuk dikarakterisasi menggunakan I-V Test, UV-VIS, dan XRD.Â  Karakterisasi I-V menunjukkan bahwa efisiensi tertinggi 1,98% didapatkan pada sampel yang di-annealing selama 5 jam yang menghasilkan Voc 263 mV, Isc 0,274 mA, Pmax 27,05 Î¼W, dan Fill Factor (FF) 0,37 ketika diiluminasi dengan intensitas cahaya 300 lux.Â  Energi gap yang didapatkan dari karakterisasi UV-VIS sebesar 3,37 â€“ 3,49 eV, sesuai dengan energi gap lapisan ZnO.Â  Karakterisasi XRD menunjukkan bahwa struktur yang dihasilkan pada waktu annealing 2 jam adalah cubic dan pada waktu annealing 5 jam adalah hexagonal.Â  Efisiensi tertinggi dihasilkan pada elektroda kerja lapisan ZnO yaitu sebesar 1,98% pada annealing 5 jam sedangkan efisien terendah 0,69% yaitu pada annealing 1 jam. Hasil ini menunjukkan bahwa lama waktu annealing mempengaruhi efisiensi DSSC.Â The effect of annealing time on ZnO thin film of the Efficiency of Dye- Sensitized Solar Cell has been investigated. The grown ZnO films were annealed in a furnace for 1 - 5 hours at a temperature of 450oC. The deposited ZnO films were characterized using the I-V test, UV-VIS, and XRD.Â  The I-V test shows that the highest of efficiency value of 1.98% was obtained for the sample annealed 5 hours with Voc 263 mV, Isc 0,274 mA, Pmax 27,05 Î¼W, and Fill Factor (FF) was 0,37 when illuminated with 300 lux light intensity. The bandgap width obtained from UV-Vis spectra is 3,37 â€“ 3,49 eV, which agrees with the energy gap of ZnO film. The XRD characterization indicated that the ZnO annealed for 2 hours has a cubic structure, while that was annealed for 5 hours is hexagonal. The highest efficiency of DSSC with ZnO electrode layer was 1.98% obtained for the sample annealed for 5 hours, whereas the lowest efficiency 0.69% was obtained for the sample annealed for 1 hour. This result indicates that longer annealing time increases the efficiency of DSSC
Ekstrak Kulit Batang Bakau sebagai Inhibitor Korosi Baja Komersil
Authors: Aini Tantri Marelita , Dahlan Dahyunir
Published: March 2022

Telah dilakukan penelitian tentang pengaruh ekstrak kulit batang bakau sebagai inhibitor korosi baja komersil.Â  Dalam penelitian ini dibentuk lapisan pada permukaan baja menggunakan metode elektrodeposisi.Â  Lapisan dibuat dari pelarutan Nikel (II) sulfat 1M, asam borat 0,24 M dan aquades dengan tambahan ekstrak kulit batang bakau pada konsentrasi 0%; 0,5%; 1%; 1,5%; 2% dan 2,5% volume.Â  Baja terkorosi dalam larutan NaOH 1 M selama 4,5 jam. Karakterisasi menggunakan mikroskop optik untuk semua sampel dan karakterisasi X-Ray Diffractometer (XRD) untuk sampel terbaik yaitu sampel yang telah dielektrodeposisi dengan konsentrasi inhibitor 2% sebelum dan sesudah korosi.Â  Laju korosi diukur menggunakan metode kehilangan berat, dimana kehilangan berat baja berbanding lurus dengan laju korosi.Â  Penambahan konsentrasi ekstrak kulit batang bakau dapat mengurangi kehilangan berat pada baja dan meningkatkan efisiensi inhibisi.Â  Efisiensi inhibisi paling besar yaitu 83% dengan penambahan 2% dan 2,5% inhibitor.Â  Karakterisasi menggunakan mikroskop optik menunjukkan baja dengan konsentrasi 2% adalah yang paling optimum karena tidak tergerus, tidak terbentuk endapan korosi dan permukaannya masih dalam keadaan halus setelah direndam dalam media korosif.Research on the effect of mangrove stem bark extract as an inhibitor of commercial steel corrosion has been conducted. This research produces a coating on the steel surface using the electrodeposition method. The coating was made from dissolving 1M nickel (II) sulfate, 0.24 M boric acid and distilled water with the addition of mangrove bark extract at a concentration of 0%; 0.5%; 1%; 1.5%; 2% and 2.5% by volume. Steel was electrodeposed for 3 minutes with a voltage of 3V. The steel corroded in 1 M NaOH solution for 4.5 hours. Characterization using an optical microscope for all samples and characterization of the X-Ray Diffractometer (XRD) for the best sample, namely samples that have been electrodeposed with 2% inhibitor concentration before and after corrosion. The corrosion rate was measured using the weight loss method, where the weight loss of steel is directly proportional to the corrosion rate. Increasing the concentration of mangrove bark extract can reduce weight loss in steel and increase inhibition efficiency. The greatest inhibition efficiency was 83% with the addition of 2% inhibitor. Characterization using an optical microscope shows that steel with a concentration of 2% is the most optimum because it is not eroded, no corrosion deposits are formed and the surface is still in a smooth state after immersing in corrosive media.
Pemodelan Kedalaman Air Tanah pada Zona Sulit Air Bersih Desa Sijantang Kota Sawahlunto Menggunakan Formulasi Water Seismic Index
Authors: Safrima Ikhwan , Pujiastuti Dwi , Pohan Ahmad Fauzi
Published: March 2022

Telah dilakukan penelitian untuk pendugaan kedalaman air tanah di desa Sijantang Sawahlunto dengan menggunakan metode seismik refraksi. Data diambil dari 3 lintasan di daerah yang memiliki struktur geologi endapan aluvial.Â  Pengolahan data dilakukan dengan menggunakan metoda Water Seismic Index (WSI), yang merupakan metoda pemanfaatan dari perlambatan gelombang geser sebagai ciri-ciri adanya air di lapisan bawah permukaan tanah. Indeks WSI 0,8 â€“ 2,0 merupakanÂ  nilai yang menunjukkan keberadaan air tanah. Dari interpretasi pengolahan data diperoleh bahwaÂ  lapisan tanah di daerah tersebut tersusun dari Â lapisan atas yangÂ  berupaÂ  kerikilÂ  di dekat permukaaan dan lapisan berikutnyaÂ  merupakan lapisan tanah pasir kering, pasir basah, lempung dan lempung lanau. Lapisan akuifer berada pada kedalaman 6.5 â€“ 16 m dan dikategorikan sebagai akuifer dangkal. Dari pengolahan data dapat dibuktikan bahwa daerah bekas tambang batubara desa Sijantang, Sawahlunto masih memiliki ketersediaan air tanah yang dapat digunakan.Â Research has been carried out to modeling the depth of groundwater in the village of Sijantang, Sawahlunto by using the seismic refraction method. The data were taken from 3 trajectories in areas that have a geological structure of alluvial deposits.Â  Data processing was carried out using the Water Seismic Index (WSI) formulation, which is a method of exploiting shear wave retarding as a characteristic of water in the subsurface layers of the soil. WSI value from 0.8 to 2.0 are values that indicate the presence of ground water. From interpretation of data processing obtained that the soil layer in the study area is composed and the top layer in the form of gravel near the surface and the next layer is a layer of dry sand, wet sand, loam and silt loam.Â  The aquifer layer is at a depth of 6.5 - 16 m and is categorized as shallow aquifer. The result showed that the former coal mining area of Sijantang village, Sawahlunto still has groundwater that can be used.
Sistem Monitoring dan Notifikasi Penggunaan Air PDAM Berbasis Arduino dan Telegram
Authors: Novelliani Jihan , Wildian Wildian
Published: March 2022

Telah dirancang sebuah perangkat sistem monitoring dan notifikasi penggunaan air PDAM digital menggunakan sensor water flow. Sensor water flow digunakan untuk mengukur debit air dan power bank sebagai sumber tegangan dengan tegangan input untuk alat yaitu 5V. Pengolahan data dilakukan dengan menggunakan mikrokontroler Arduino Uno yang menampilkan hasil pengukuran di layar LCD serta berupa notifikasi di aplikasi telegram dengan modul ethernet shield sebagai media transmisi data. Alat yang dihasilkan mampu menampilkan jumlah penggunaan debit air dan biaya penggunaan air secara real time yang dapat diakses dengan menggunakan aplikasi telegram. Pengujian dilakukan dengan memvariasikan volume air dari 1 L sampai 5 L dengan selisih 0,5 L untuk setiap pengujian, Hasil pengujian menunjukkan perangkat sudah dapat bekerja dengan baik. Persentase kesalahan rata-rata sebesar 4.38 % terhadap alat pembanding yaitu gelas ukur.Â A system of monitoring and notification of digital PDAM water using a water flow sensor has been designed. The water flow sensor is used to measure the water debit and power bank as a voltage source with the input voltage for the device called 5V. Data processing is carried out using an Arduino Uno microcontroller which displays the measurement results on the LCD screen as well as a notification in the telegram application with the ethernet shield module as a data transmission medium. The resulting tool's able to display the amount of water discharge usage and water usage fees in real time which can be accessed using the telegram application. The test is carried out by varying the volume of water from 1 L to 5 L with a difference of 0.5 L for each test. The test results show that the device is working properly. The average error percentage is 4.38% for the comparison tool, namely the measuring cup.Â
Pengaruh Penambahan Serat Daun Nanas terhadap Sifat Fisis dan Mekanik Papan Semen Gipsum
Authors: Oktaviani Siska , Puryanti Dwi
Published: March 2022

Penelitian tentang pengaruh penambahan serat daun nanas terhadap sifat fisis dan mekanik papan semen gipsum telah dilakukan dalam bentuk komposit laminat. Persentase serat daun nanas yang digunakan adalah 0%, 2%, 4%, 6%, 8%. Sifat fisis yang diuji meliputi densitas dan daya serap air. Nilai densitas terendah diperoleh pada persentase serat daun nanas 8% yaitu 1,41 kg/cm3. Nilai densitas berbanding terbalik dengan nilai daya serap air. Persentase serat daun nanas 8% memiliki nilai densitas terkecil tetapi daya serap air yang besar. Nilai daya serap air pada persentase serat daun nanas 8% yaitu 39,17%. Pengujian mekanik yang diuji meliputi kuat tekan dan kuat lentur. Alat uji yang digunakan untuk kuat tekan dan kuat lentur adalah Universal Testing Machine (UTM). Nilai kuat tekan 5 kg/cm2 hingga 11,67 kg/cm2 telah memenuhi SNI 03-3449-2002. Nilai kuat lentur tertinggi pada persentase serat 2% dan 6% yaitu 21 kg/cm2 telah memenuhi SNI 01-4449-2006.Â The research on the effect of pineapple leaf fiber addition to the physical and mechanical properties of gypsum cement board has been carried out in the form of laminate composites. The percentage of pineapple leaf fiber used is 0%, 2%, 4%, 6%, 8%. Physical properties that were tested including density and water absorption. The lowest density value obtained at pineapple leaf fiber percentage of 8% that is 1.41 kg / cm3. The value of density inversely proportional to the value of water absorption. Percentage of 8% pineapple leaf fiber has the smallest density value but large water absorption. The value of water absorption at pineapple leaf fiber percentage 8%, that is 39.17%. Mechanical properties that were tested including compressive strength and flexural strength. The compressive strength and flexural strength were measured using Universal Testing Machine (UTM). The value of compressive strength that isÂ Â Â Â Â Â Â Â Â Â  5 kg/cm2 to 11.67 kg/cm2 meets SNI 03-3449-2002. Highest flexural strength at fiber percentage 2% and 6%, that is 21 kg / cm2 meat SNI 01-4449-2006.Â
Analisis Kurva Profile Dose Menggunakan Lapangan Radiasi Elektron pada Pesawat LINAC Tipe Clinac-Cx di Rs Unand
Authors: Sumitra Nanang , Milvita Dian , Kanie Muhammad Al Jabbar
Published: March 2022

Telah dilakukan analisis kurva profile dose menggunakan lapangan radiasi elektron pada pesawat LINAC tipe Clinac-CX di RS Unand. Penelitian ini menggunakan berkas elektron energi 9, 12, 15,18 MeV pada lapangan radiasi no off-set, off-set 1 cm, off-set 3 cm yang bertujuan untuk mengetahui pengaruh energi dan lapangan radiasi terhadap nilai symmetri, flatness dan penumbra. Hasil penelitian menunjukkan bahwa nilai symmetry dan flatness pada tiap energi dan lapangan radiasi masih dalam batas toleransi yang ditetapkan oleh AAPM TG-40 yaitu 3%. Begitu juga dengan nilai penumbra yang diperoleh masih dalam batas toleransi yaitu (10-15) mm.Â Research on the analysis of profile dose curves has been carried out using electron radiation fields on LINAC Clinac-CX type aircraft at Unand Hospital.Â  This study uses electron beam energy 9, 12, 15.18 MeV using a radiation field no off-set, off-set 1 cm, off-set 3 cm which aims to determine the effect of energy and radiation field on the symmetry, flatness and penumbra values. The results showed that the symmetry and flatness values in each energy and radiation field were still within the tolerance limits set by the AAPM TG-40 at 3%. As well the penumbra value obtained is still within the tolerance range of 10-15 mm.
Analisis Kecocokan Nilai Percepatan Tanah Pulau Lombok Berdasarkan Perhitungan Empiris dengan Data Percepatan Tanah dari Akselerograf di Stasiun Mataram
Authors: Saputri Diana , Pujiastuti Dwi
Published: March 2022

Telah dilakukan perhitungan nilai percepatan tanah Pulau Lombok yang divalidasi dengan nilai percepatan tanah di Stasiun Mataram.Â  Percepatan tanah dihitung dengan beberapa rumusan empiris, yaitu Mc. Guire, Fukushima-Tanaka, Esteva dan Donovan.Â  Data gempa yang digunakan adalah data gempa bumi di Pulau Lombok dan sekitarnya pada periode 1979-2018.Â  Hasil validasi menunjukkan rumusan Fukushima adalah rumusan terbaik untuk menghitung percepatan tanah di Pulau Lombok dengan persentase kesalahan rata-rata terendah 220%, sedangkan rumusan lainnya memiliki persentase kesalahan rata-rata Mc. Guire 2.586%, Esteva 614%, dan Donovan 3.906%.Â  Berdasarkan hasil yang diperoleh maka rumusan Fukushima-Tanaka adalah rumusan yang paling cocok untuk menghitung nilai percepatan tanah di Pulau Lombok.Â The calculation of Lombok Island ground acceleration values which are validated with the value of acceleration of the land at Mataram Stationhas been carried out.Â  Land accelerationis calculated by several empirical formulations,Â  namely Mc. Guire, Fukushima-Tanaka, Esteva and Donovan.Earthquake data used is earthquake data on the Lombok Islandand its surrounding in the periode 1979-2018. Validation result show thatFukushima-Tanaka is the best formula for calculating the acceleration of land on the Lombok Island with the average percentage error 220%, while the other formulations have an average percentage error Mc. Guire 2.586%, Esteva 614%, and Donovan 3.906%. Based on the result obtained, the formula Fukushima-Tanaka is the most suitable formula for calculating the value of land acceleration on the Lombok Island.
Pemanfaatan Data Alos PALSAR Untuk Etimasi Pergerakan Tanah Kota Padang Upaya Mitigasi Bencana Longsor
Authors: Ckhotimah Husnul , Vonnisa Mutya , Budiman Arif
Published: March 2022

Telah dilakukan penelitian untuk mendeteksi besar pergerakan tanah sebagai faktor pendorong penyebab terjadinya bencana longsor di Kota Padang.Â  Penelitian ini menggunakan data penginderaan jauh yakni data citra ALOS PalSAR tahun 2008 sampai 2009.Â  Metode yang digunakan dalam pengolahan adalah Differential Interferometry Synthetic Radar (DInSAR). Metode ini dapat mengamati pergerakan tanah terutama pada daerah perbukitan dengan ketelitian sentimeter.Â  Hasil penelitian menunjukkan besar pergerakan tanah untuk wilayah di Kota Padang berkisar antara 0,33- 3,04 cm/tahun.Â  Dari 11 kecamatan di Kota Padang, lima diantaranya yakni Kecamatan Pauh, Padang Selatan, Bungus Teluk Begalung, Koto Tangah dan Kuranji mengalami pergerakan atau pergeseran tanah yang cukup besar dari kecamatan lainnya yakni berkisar antara 0,825- 2,31 cm/tahun. Besarnya pergerakan tanah tersebut menyebabkan lima kecamatan di atas sering mengalami bencana tanah longsor dengan kategori cukup rawan.Â Research has been conducted to detect the magnitude of land movement as a driving factor for the occurrence of landslides in the city of Padang. This study uses remote sensing data namely ALOS PalSAR image data from 2008 to 2009. The method used in processing is Differential Interferometry Synthetic Radar (DInSAR). This method can observe the movement of the soil, especially in hilly areas with sub-centimeter accuracy. The results showed the amount of land movement for the area in Padang City ranged from 0,33 to 3,04 cm /year. Of the 11 districts in the city of Padang five of them namely the District of Pauh, South Padang, Bungus Teluk Begalung, Koto Tangah and Kuranji experienced substantial land movements or shifts from other districts which ranged from 0,825 to 2,31 cm /year. The magnitude of land movements and the high level of rainfall causes the five districts often experience landslides in quite vulnerable categories.
Verifikasi Nilai Dosis Radiasi Berkas Elektron Pesawat LINAC dengan Luas Lapangan Blok Cerrobend (6Ã—6) cm2 dan (8Ã—8) cm2 Berdasarkan Protokol IAEA TRS 398
Authors: Ramona Fransischa , Milvita Dian , Diyona Fiqi
Published: March 2022

Telah dilakukan penelitian Â verifikasi nilai dosis radiasi berkas elektron pesawat LINAC dengan luas lapangan blok cerrobend (8Ã—8) cm2, (6Ã—6) cm2 dan tanpa blok (10Ã—10) cm2. Penelitian bertujuan memperoleh Â nilai dosis radiasi menggunakan blok cerrobend dan tanpa blok agar sesuai dengan dosis radiasi Treatment Planning System (TPS) dan batas toleransi yang ditetapkan protokol IAEA TRS 398 yaitu Â±2%.Â  Pada penelitian digunakan energi berkas elektron (4, 6, 9, dan 12) MeV menggunakan slab phantom dengan detektor ionisasi chamber plane parallel.Â  Ketebalan blok cerrobend yang digunakan adalah 1,83 cm. Â Hasil penelitian menunjukkan bahwa dosis radiasi yang dihasilkan menggunakan blok cerrobend lebih tinggi daripada tanpa menggunakan blok cerrobend. Hal ini karena semakin luas ukuran lapangan radiasi, maka akan semakin rendah dosis radiasi yang diterima dan semakin banyak radiasi hambur terjadi. Â Nilai deviasi dosis radiasi yang terukur pada slab phantom terhadap dosis radiasi TPS masih memenuhi toleransi yang ditetapkan oleh protokol IAEA TRS 398 yaituÂ  -0,81 % sampai dengan 1,36%.Â Verification of radiation values of instrument LINAC electron beam with field size of the cerrobend block (8Ã—8) cm2, (6Ã—6) cm2and without block (10Ã—10) cm2 has been conducted.Â  This study aims to get the value of radiation dose using cerrobend blocks and without block to equal with dose radiation Treatment Planning System (TPS) and the tolerance limits established protocol IAEA TRS 398 which is Â± 2%. The study use electron beam energy (4, 6, 9, and 12) MeV using slab phantom with ionization chamber plane parallel detectors.Â  The thickness of the cerrobend block use Â 1.83 cm. The results show that using cerrobend block produce a greater dose radiation than without block.Â  This due to the larger the size of the radiation field, the lower the dose received and the more scaterring radiation. Deviation value dose radiation of measurement in slab phantom to dose radiation TPS still within the tolerance by protocol IAEA TRS 398 that is -0.81% to 1.36%.
Sintesis Nanopartikel Zink Ferit (ZnFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Struktur Kristalnya
Authors: Gestarila Cinthia , Puryanti Dwi
Published: March 2022

Penelitian mengenai sintesis nanopartikel ZnFe2O4 telah dilakukan dengan menggunakan metode kopresipitasi. Sintesis nanopartikel dilakukan dengan variasi konsentrasi NH4OH yaitu 1,5 M, 3 M, dan 6 M. Nanopartikel ZnFe2O4dikarakterisasi menggunakan XRD (X-Ray Diffraction) dan SEM (Scanning Electron Microscope). XRD (X-Ray Diffraction) dilakukan untuk mengetahui fasa yang terbentuk dan ukuran kristal yang dihasilkan pada sampel. Ukuran kristal dihitung menggunakan persamaan Schrerer dan diperoleh berturut-turut adalah 26 nm; 26 nm; dan 27nm. SEM (Scanning Electron Microscope) dilakukan untuk mengetahui morfologi permukaan dan ukuran partikel. Hasil perhitungan menggunakan image-j diperoleh ukuran partikel berturut-turut adalah 49 nm; 43 nm; dan 34 nm. Nilai suseptibilitas magnet ZnFe2O4yang dihasilkan berturut-turut adalah 997,3Ã—10-8m3kg-1; 102,6Ã—10-8m3kg-1; dan 739Ã—10-8m3kg-1.Â Â Research on synthesis of zinc ferrite (ZnFe2O4) nanoparticles has been conducted using the coopresipitation method. Synthesis of nanoparticles was carried out with variations in NH4OH concentrations of 1.5 M, 3 M, and 6 M. ZnFe2O4 nanoparticles were characterized using XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscope). XRD (X-Ray Diffraction) is carried out to determine the phases contained and the size of the crystal produced in the sample. The size of crystals is calculated using the Scherrer equation obtained that the results are 26; 26; and 27 nm. SEM is performed to determine the surface morphology and particle size. The results of characterization using image-j are 49 nm; 43 nm; and 34 nm. The susceptibility test using bartington MS2 magnetic susceptibility meters was perfomed to determine the value of magnetic contained in the material. The result of successive magnetic susceptibility are 997.3Ã—10-8m3kg-1; Â Â 102.6Ã—10-8m3kg-1; and 739Ã—10-8m3kg-1.
Sintesis Nanopartikel Manganese Ferrite (MnFe2O4) dari Pasir Besi dan Mangan Alam dengan Metode Kopresipitasi
Authors: Putri Nixcoriani , Puryanti Dwi
Published: March 2022

Sintesis nanopatikel Mangananese ferrite telah dilakukan menggunakan metode kopresipitasi dengan memvariasikan konsentrasi NH4OH 1,5 M; 5 M; dan 10 M. Bahan baku yang digunakan adalah pasir besi dan mangan alam. X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), dan Bartington MS2 Magnetic Susceptibility Meter masing-masing digunakan untuk mengkarakterisasi struktur, ukuran partikel dan sifat magnetik mangan ferit yang dihasilkan. Ukuran kristal dihitung menggunakan persamaan Scherrer dimana ditemukan bahwa ukuran kristal meningkat seiring dengan berkurangnya konsentrasi NH4OH sebesar 27 nm, 26 nm, dan 20 nm. Ukuran partikel dihitung menggunakan Software Image-J menunjukan bahwa ukuran partikel tidak berubah yaitu sebesar 27 nm. Variasi konsentrasi NH4OH berada dalam rentang mineral hematite 86,51 - 423,75 (x10-8m3kg-1) yang memiliki sifat antiferomagnetik. Mangan ferit yang dihasilkan termasuk dalam karakteristik mangan lunak.Â Nanoparticles manganese Ferrite have been synthesis using copresipitacion method with various concentration of NH4OH 1,5 M; 5 M; and 10 M. Raw materials used are iron sand and natural manganese. X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Bartington MS2 Magnetic Susceptibility Meter we used to characterize the structure, particle size, and magnetic properties of the resulted manganese ferrite. The crystal size was estimated using the Scherrer formula the particle sizeÂ  increased 27 nm; 26 nm; dan 20 nm Â with the decrease of NH4OH. The particle size was estimated using software Image-J were found that the particle size of 27 nm increased with the decrease of concentration of NH4OH. Magnetic characterization of manganese ferrite nanoparticles was investigated by using a magnetic susceptibility. NH4OH concentration various is on the range of hematite minerals 86,51-423,75 (x10-8m3kg-1) which have antiferomagnetic properties.
PENGARUH ELEMEN BAURAN PEMASARAN PRODUK PASTA GIGI SENSODYNE TERHADAP KEPUTUSAN PEMBELIAN KONSUMEN
Authors: Andre Kristoforus , Sumaryati Margaretha
Published: March 2022

This study aims to determine the effect of marketing mix elements of Sensodyne toothpaste on consumer purchasing decision. Marketing mix consists of product, price, distribution, and promotion which can be controlled by the company and being used to influence consumer purchasing decision. On the other hand, consumer sees the marketing mix as the appeal of a product. Sample collection was done by distributing questionnaires to 100 respondents with Convenience sampling method. Then, the data is processed by using SPSS version 18.0. Results from this study showed that the variables of the marketing mix (product, price, distribution, and promotion) simultaneously have a significant influence on purchasing decision of Sensodyne toothpaste. Partially, there are two variables that have no significant effect, which are distribution and promotion, while two other variables significantly influence consumer purchasing decision. The most influential variable is the variable of product.
ANALISIS PERBEDAAN FENOMENA SHORT-TERM UNDERPRICING DAN LONG-TERM UNDERPERFORMANCE PADA SAHAM PERUSAHAAN BUMN DAN BUMS YANG MELAKUKAN IPO DI BEI TAHUN 2000--2010
Authors: Widhawati Indira Rully , Panjaitan Yunia
Published: March 2022

The research is intended to analyze short term underpricing and long term underperformance on state and private company shares. Samples used are 11 state company share and 97 private sector share which experienced short term underpricing with average first day return method plus 7 state company shares and 91 state company shares which had long term underperformance using 3 years  buy and hold method and wealth relative. By using different test non parametric Mann-Whitney U is concluded that private sectors shares has higher underpricing level which give benefit to short term investor. While State company shares has better performance on long term with WR level reaching 1 compared to private sector shares.
PENGARUH CUSTOMER EXPERIENCES TERHADAP REVISIT INTENTION DENGAN MEDIASI LEARNING IN MUSEUM DAN VISITOR SATISFACTION DI MUSEUM WAYANG
Authors: Dewi Intan Audrey Indira , Laksmidewi Dwinita
Published: March 2022

Revitalization of the museum in various cities in Indonesia by the government, including in Jakarta, aims to increase visits. To support this objective, museum needs to do the proper marketing strategies, one through experiential marketing approach.This study aims to reveal the effect of the customer experience on  revisit intention with learning in museum and visitor satisfaction as mediation, from the perspective of museum visitors. This research was conducted at Museum Wayang, Jakarta. The result showed that customer experience in terms of five dimensions namely, sense, feel, think, act, and relate have positive effect on revisit intention through learning in museum and visitor satisfaction as mediating variables.
ANALISIS PERBEDAAN RETURN SAHAM, TRADING VOLUME ACTIVITY DAN BID-ASK SPREAD SEBELUM DAN SESUDAH STOCK SPLIT
Authors: Widiatmoko Arif , Paramita V. Santi
Published: March 2022

The purpose of this research is to know stock return, trading volume activity and ¬bid-ask spread before and after stock split at company listed in Indonesia Stock Exchange. This study was conducted on all companies listed in Indonesia Stock Exchange 2010-2014 period with the number of research samples of 30 companies through purposive sampling technique. Data collection method used is non-participant technique with data analysis technique Paired Samples T-Test. Based on the result found that there is no difference between stock return, trading volume activity and ¬bid-ask spread before and after stock split.
DAMPAK DIMENSI-DIMENSI SERVQUAL TERHADAP CUSTOMER SATISFACTION PADA RETAIL ONLINE SHOPPING
Authors: Hidayat Herlin , Ramawati Yussi , Darmoyo Syarief
Published: March 2022

Perkembangan online shop yang pesat berkat dukungan kemajuan teknologi dan informasi, dan terjadi hampir di seluruh belahan dunia. Setiap usaha yang dilakukan oleh semua jenis bisnis semestinya bermuara pada kepuasan pelanggannya. Penelitian ini dilakukan untuk menilai bisnis telah dijalankan telah berdampak pada kepuasan pelanggan. Dari hasil penelitian diketahui bahwa terdapat dampak dari dimensi-dimensi service quality terhadap customer satisfaction. Pemilik usaha online shop perlu selalu memperhatikan, mempertahankan dan meningkatkan pada setiap dimensi service quality supaya selalu mampu mencapai kepuasan pelanggannya demi langgengnya bisnis.
PENGARUH OCCUPATIONAL SELF EFFICACY TERHADAP WORK ENGAGEMENT YANG DIMEDIASI OLEH HUMAN RESOURCE DEVELOPMENT CLIMATE DI PT OLYMPIC BANGUN PERSADA
Authors: Ariani Adelina , Nugroho Yohanes Arianto
Published: March 2022

The purpose of this research is to inspect the impact Occupational Self Efficacy on Work Engagement with the role of Human Resource Development Climate as mediating variable. This research was conducted at the Head Office of PT OLYMPIC BANGUN PERSADA involving several employee within the organization. The authors distribute questionnaires consisting of 15 questions about Occupational Self Efficacy, 15 questions about Work Engagement, 15 questions about Human Resources Development Climate to 100 respondents at PT OLYMPIC BANGUN PERSADA. The data were processed with SPSSv23 and macro Hayes v3. The findings showed significant relationship was found between all variables in the study. All the study hypotheses were supported. Human Resource Development Climate was found to partially mediate the relationship between Occupational Self-Efficacy and Work Engagement. The findings on respondents showed that Human Resource Development Climate has a role as complementary mediation.
PENGARUH GREENWASHING TERHADAP EKUITAS MEREK DAN NIAT PEMBELIAN: SUATU STUDI EMPIRIS
Authors: Valencia Devona , Sihombing Sabrina Oktaria , Mien Mien
Published: March 2022

Tujuan dari artikel ini adalah untuk memprediksi pengaruh greenwashing, ekuitas merek hijau, kredibilitas merek, asosiasi merek hijau dan niat pembelian. Sebagai objek pada penelitian, satu merek dipilih, yaitu The Body Shop. Data dikumpulkan dari 260 konsumen dengan menggunakan metode survei, dan structural equation modeling dilakukan untuk menguji hipotesis penelitian.Sebagai hasil, ditemukan bahwa asosiasi merek hijau dan kredibilitas merek mempengaruhi ekuitas merek hijau secara positif, dan ekuitas merek hijau memiliki pengaruh positif dan kuat pada intensitas pembelian konsumen. Selain itu, greenwashing berdampak negatif lemah pada asosiasi merek hijau dan kredibilitas merek, dan karenanya, secara tidak langsung mempengaruhi ekuitas merek hijau dan niat pembelian.
Removal of a central venous catheter penetrating the vertebral artery: A case report on endovascular treatment for blunt cerebrovascular injury
Authors: Kaneko Ryosuke , Ikeda Hiroyuki , Uezato Minami , Chin Masaki
Published: March 2022

Background:

Anticoagulation and endovascular therapy are commonly used treatment methods for blunt cerebrovascular injury (BCVI). However, in certain cases, the perforating objects damaging the blood vessels need to be removed. In such cases, stenting and coil embolization have been reported to be useful. Furthermore, we believe that distal embolization can arrest bleeding at the perforation site when using such treatments. In support of this procedure, we report a case of successful BCVI treatment using distal embolization through contralateral side and proximal protection.

Case Description:

A 61-year-old man had an accidental placement of a central venous catheter that resulted in the perforation of the vertebral artery. Endovascular treatment was performed to remove the catheter and prevent bleeding during extraction. For this treatment, we used the method of distal embolization through the contralateral approach and proximal protection with a microballoon catheter followed by removal of the perforating catheter and additional embolization of the bleeding point under controlled blood flow.

Conclusion:

Under distal and proximal protections, we were able to successfully remove the perforating catheter without bleeding and ischemic complications. While treating BCVI, which requires the removal of perforating material, attention should be paid to the various protection methods and procedures.
Cerebral sinus thrombosis as an initial symptom of acute promyelocytic leukemia: Case report and literature review
Authors: Salgado-Lopez Laura , Custozzo Amanda , Raviv Nataly , Abdelhak Tamer , Peris-Celda Maria
Published: March 2022

Background:

Cerebral sinus thrombosis as presentation of acute promyelocytic leukemia (AMPL) is exceptional, with only three cases registered in the literature.

Case Description:

A 24-year-old female patient was transferred to our center after a car accident. The patient had a witnessed generalized seizure while driving. Computerized tomography (CT) demonstrated a temporal intraparenchymal hemorrhage and CT venogram diagnosed a cerebral sinus thrombosis on the left transverse and sigmoid sinus. The patient underwent surgical evacuation of the hematoma and was treated with anticoagulation 48 h after surgery. Pancytopenia alerted of a possible hematological disorder. The patient was subsequently diagnosed with AMPL and treated with arsenic trioxide. The patient had a complete neurological recovery with no postoperative complications.

Conclusion:

The management of cerebral sinus thrombosis in patients with AMPL remains controversial. The previous reported cases of cerebral sinus thrombosis preceding the diagnosis of AMPL are reviewed and treatment of cerebral sinus thrombosis with anticoagulation in the setting of intraparenchymal hemorrhage and bleeding disorders is also discussed.
Analisis Kesalahan Siswa dan Remedialnya Dalam Mengerjakan Soal Cerita Perbandingan Matematika
Authors: Wulanningtyas Melania Eva , Marhaeni Nafida Hetty
Published: March 2022

Problem solving mathematics error in a matter of story on ratio material worth and turn around values still often occur, so we need a remedial program to minimize these errors. For this reason, this study aims to determine the types of errors, remedial program steps and types of errors after the remedial program. This research is a qualitative descriptive study with the data collection method uses tests, interviews, and personal documents. The study was conducted at eighth grade of SMP Pangudi Luhur 1 Yogyakarta. This study applies a layered validation strategy in the form of triangulation techniques, Focus Group Discussion (FGD) and the involvement of resource persons and experts. The results showed that the dominant error in the form of an error did not understand the command problem with a percentage of 43%, the error shown if every step taken by students was correct but the final result given was not a solution done with a percentage of 80% and a calculation error with a percentage of 20%. After the results are obtained remediation efforts are made. Based on the remediation results that have been made, there is a decrease in 3 categories of dominant student errors, namely mistakes not understanding the question command to a percentage of 31%, errors that are shown if each step taken by students is correct but the end result given is not a completion done to 60%. Thus, the remediation program makes fewer types of mistakes made by students than before remediation
A CLINICAL CASE OF SUCCESSFUL TREATMENT OF ACUTE MYOCARDITIS COMPLICATED BY CIRCULATORY ARREST IN COVID-19 INFECTION IN A PATIENT DURING EARLY POSTPARTUM PERIOD
Authors:   Grodno State Medical University, Grodno, Belarus, Snezhitskiy V. A. , Yanushka A. V. ,   Grodno Regional Clinical Cardiology Center, Grodno, Belarus, Yakubtsevich R. E. ,   Grodno State Medical University, Grodno, Belarus, Balla A. A. ,   Grodno State Medical University, Grodno, Belarus, Sanko O. E. ,   Grodno Regional Clinical Cardiology Center, Grodno, Belarus, Grib S. N. ,   Grodno Regional Clinical Cardiology Center, Grodno, Belarus, Kratkou K .O. ,   Grodno Regional Clinical Cardiology Center, Grodno, Belarus, Kondrichina D. D. ,   Grodno Regional Clinical Cardiology Center, Grodno, Belarus
Published: March 2022

Currently, the COVID-19 pandemic affects all general population. The greatest danger of the infection is for women in the early postpartum period. It should be considered that in this period the patient has a tendency to disrupt the hemostasis system, which can lead to death in COVID-19 infection. This clinical review presents the experience of complex treatment and application of the extracorporeal membrane oxygenation system in a patient with acute cardiovascular failure for COVID-19 infection in the early postpartum period, who was hospitalized at the Grodno Clinical Cardiology Center.
X-RAY ENDOVASCULAR SURGERY OF ATHEROSCLEROTIC OCCLUSIVE-STENOTIC LESIONS OF THE SUPERFICIAL FEMORAL ARTERY (LITERATURE REVIEW)
Authors:   Grodno State Medical University, Grodno, Belarus, Iаskevich N. N. , Chaikouski V. V. ,   Grodno State Medical University, Grodno, Belarus, Obukhovich А. R. ,   Grodno University Clinic, Grodno, Belarus, Vasilchuk L. F. ,   Grodno University Clinic, Grodno, Belarus
Published: March 2022

Background. Occlusive-stenotic atherosclerotic lesion of the superficial femoral artery is the most common cause of the development of chronic ischemia of the lower extremities. Bypass surgery, traditionally performed when conservative treatment fails, is frequently associated with trauma. In this regard, balloon angioplasty and stenting are more promising. However, their outcomes need to be carefully studied. The purpose of the study. To analyze the literature on the results of roentgen-endovascular surgery (balloon angioplasty and stenting) in chronic occlusive-stenotic atherosclerotic lesion of the superficial femoral artery and the influence of different factors on its outcomes. Material and methods. A total of 39 sources of literature were analyzed. Results. The outcomes of balloon angioplasty and stenting of the superficial femoral artery depend on the period of postoperative monitoring, comorbidities and are determined by clinical, anatomical, technical and hemodynamic factors. For the moment the search for ways of restenosis and reocclusion prevention in the areas of X-ray endovascular interventions is very relevant. Conclusions. The outcomes of balloon angioplasty and stenting of the superficial femoral artery depend on the timing of postoperative monitoring and are determined by clinical, anatomical, technical and pathophysiological factors. The search for ways to prevent restenoses and reocclusions in the areas of X-ray endovascular interventions is relevant.
IMPORTANCE OF AGGRAVATING FACTORS IN THE DEVELOPMENT OF DESTRUCTIVE PULMONARY TUBERCULOSIS
Authors:   Grodno State Medical University, Grodno, Belarus, Sheifer Yu. A. , Gelberg I. S. ,   Grodno State Medical University, Grodno, Belarus, Wolf S. B. ,   Grodno University Clinic, Grodno, Belarus, Demidik S. N. ,   Grodno University Clinic, Grodno, Belarus, Aleksa A. N. ,   Grodno University Clinic, Grodno, Belarus
Published: March 2022

Background: At present, despite the generally favorable pathomorphosis of tuberculosis (TB), a number of factors that have a negative impact on the epidemiological situation, clinical manifestations and treatment outcomes remain. Objective: To determine the role of aggravating factors in the development of destructive pulmonary tuberculosis. Material and methods: A prospective cohort study was conducted. The patients who were admitted to the inpatient department of the Grodno Regional Clinical Center "Phthisiology", as well as to the Republican Tuberculosis Hospital "Novoelnya" were examined. Depending on the prevailing aggravating factor, the patients were divided into 10 groups. In addition, 2 more groups of patients with the presence of extensive drug resistance of mycobacterium tuberculosis (XDR MBT) were formed. The obtained results indicate a significant negative influence of aggravating factors on the formation of destructive processes in the lungs. As more significant cases in terms of these factors should be considered the patients with TB, accompanied by diabetes mellitus (DM), alcohol dependence syndrome (ADS), chronic nonspecific respiratory diseases (HNRD), as well as those who arrived from correctional labor institutions and those with the presence of several factors at the same time. Results: The analysis of the obtained results shows that in all cohorts of patients, the frequency of the decay cavities exceeds that in patients with pulmonary tuberculosis without the presence of significant risk factors. Conclusions: The results obtained indicate that the frequency of the formation of destructive forms of tuberculosis in MDR-TB depends on a number of aggravating factors. The most significant of them in this regard are DM, the presence of several factors at the same time, ADS, staying at correctional labor institutions as well as HNRD. Factors such as contact or diseases of the gastrointestinal tract do not have a significant effect on the formation of destruction in the lungs in MDR-TB. In the presence of XDR-TB, the highest frequency of destructive forms (over 70%) is observed, it reaching 76.0% in patients with XDR-TB combined with ADS.
DYNAMICS OF BLOOD CORTISOL LEVELS DURING HEART SURGERY IN MULTICOMPONENT GENERAL ANESTHESIA
Authors:   Gomel State Medical University, Gomel, Belarus, Osipenko D. V. , Skarakhodau A. A. ,   Gomel Regional Clinical Cardiological Center, Gomel, Belarus
Published: March 2022

Objectives. The severity of the stress hormonal response during operations on heart valves in cardiopulmonary bypass (CPB) in multicomponent general anesthesia (GA) was evaluated by determining the level of plasma cortisol at different stages of the operation. Material and methods. Cortisol levels were studied in 24 patients who had undergone heart valve surgery in CPB. Results. At the stage 10 minutes before the start of the IC, cortisol levels were in the range of physiological values, at the end of the surgical intervention, cortisol increased by 3.3 (3.0; 5.2) times, compared with preoperative period. Conclusion. The level of plasma cortisol equal to 586.2 (410.7; 733.0) nmol/l at the patient's admission to the operating room, 426.3 (299.3; 597.0) nmol/l 10 minutes before the start of CPB, with its increase to 2170.6 (2077.0; 2427.2) nmol/l at the end of the operation, is the stress norm during operations on heart valves in GA.
Hydrogen Activation by Benzene-Ruthenium Complexes in Aqueous Solution: Synthesis, Molecular Structure, and Intercalation of the Cluster Cation [{C₆H₆)₄Ru₄H₄]²⁺
Authors: Bodensieck Ulf , Meister Annette , Meister Götz , Rheinwald Gerd , Stoeckli-Evans Helen , Süss-Fink Georg
Published: March 2022

The hydrogenation of the aqua complex [(C6H6)Ru(H2O)3]2+, prepared in situ by hydrolysis of (C6H6)2Ru2Cl4 in water, was found to lead to the tetranuclear cluster dication [(C6H6)4Ru4H4]2+ (1) which crystallizes as the dichloride from the aqueous solution. In the presence of acetate ions, however, the reaction yields the dinuclear cations [(C6H6)2Ru2H(OOCCH3)X]+ (X=OH: 2, X=Cl: 3) which crystallize as the hexafluorophosphate salts. The X-ray crystal-structure analysis of [(C6H6)4Ru4H4]Cl2 reveals the cluster dication 1 to consist of a tetrahedral ruthenium framework; the four hydrido ligands are presumably coordinated to three faces and to one edge of the Ru4 tetrahedron. The cationic complexes 1 and 2 have been found to intercalate in sodium hectorite.
Fixierung von Sulfonsäure-hydraziden an dreikernigen Ruthenium-Clustern: Synthese und Struktur von (μ₂-H)Ru₃(CO)₉[μ₃-η²-H₂NNS(O)₂Mes]
Authors: Rheinwald Gerd , Stoeckli-Evans Helen , Süss-Fink Georg
Published: March 2022

Sulfonic hydrazides were found to react thermally with Ru3(CO)12 without cleavage of the N–N bond resulting in the formation of trinuclear hydrazido clusters. The X-ray structure analysis of the derivative (μ2-H)Ru3(CO)9[μ3-η2-H2NNS(O)2Mes] shows a triangular Ru3 framework capped by an intact N–N unit.
Enantioselective Formation of Amino Acids by Isomerization of Mixed Ligand Copper(ll) Schiff-Base Complexes
Authors: Chuard Thierry , Gretillat François , Bernauer Klaus
Published: March 2022

The formation of optically active phenylalanine from phenylpyruvic acid and pyridoxamine in the presence of various chiral CuII complexes was investigated as a function of the reaction conditions. The enantioselectivity of the reaction, as well as the pH- and ligand-dependant racemization of the product, is discussed in terms of possible reaction pathways and the most likely structure of intermediate [Cu(L)aldimine] complexes.
CORRELATION AND REGRESSION ANALYSIS OF THE DEPENDENCE OF THE SIZE OF THE RUSSIAN AND WORLD DECISION MARKETS IN THE FIELD OF ARTIFICIAL INTELLIGENCE AND NEUROTECHNOLOGY
Authors: Афанасьев Г.И. , Нестеров Ю.Г. , Панова Д.А.
Published: March 2022

Актуальность темы обусловлена интенсивным развитием решений на основе искусственного интеллекта и нейротехнологий, а также ростом запроса на них со стороны бизнеса, общества и государства. Президент Российской Федерации, В. Путин, назвал искусственный интеллект ресурсом колоссальной силы . 11 октября 2019 года на официальном интернет-портале Государственной системы правовой информации опубликован Указ Президента Российской Федерации 490 О развитии искусственного интеллекта в Российской Федерации 1. Целью работы является изучение корреляционной зависимости размера российского и мирового рынков решений в сфере искусственного интеллекта и нейротехнологий. При выполнении работы использованы исходные данные из Дорожной карты развития сквозной цифровой технологии Нейротехнологии и искусственный интеллект опубликованной на официальном сайте Министерства цифрового развития, связей и массовых коммуникаций Российской Федерации 14 октября 2019 2.

The relevance of the topic is due to the intensive development of the researches based on artifi cial intelligence and neurotechnologies, as well as growth of requests from business, society and government. The President of the Russian Federation, Vladimir Putin, called the artifi cial intelligence as a resource of colossal power . On October 11, 2019, the Decree of the President of the Russian Federation 490 On the development of artifi cial intelligence in the Russian Federation was published on the offi cial Internet portal of the State system of legal information 1. The aim of the work is to study the correlation of market size of Russian market and global market in the fi eld of AI and neurotechnologies. When perfor ming the work, the following baseline data was used: Roadmap of end-to-end digital technology development of neurotechn ology and artifi cial intelligence published on the offi cial site of Ministry of Digital development, communications and mass communicators of the Russian Federation 14 October 2019 2.