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PREPARASI DAN KARAKTERISASI SIFAT FISIS ION Nd3+ DIDOPING PADA GELAS Na2O-PbO-ZnO-Li2O-B2O3 Rajagukguk, Juniastel; Simamora, P.; Aminudin, A.; Djamal, M.; Suprijadi, -; Hidayat, R.
Jurnal Spektra Vol 16, No 3 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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AbstrakTelah berhasil dilakukan pembuatan medium gelas dengan komposisi (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O (x = 0,05; 0,1; 0,5; 1,0; 2,0 dam 4,0 mol%) dan didoping oleh ion aktif xNd2O3. Melalui pendopingan ion Nd3+ ini diharapkan diperoleh medium aktif berupa gelas yang dapat diaplikasikan sebagai penguat optik atau medium laser untuk rentang panjang gelombang pada near infra red (NIR). Semua senyawa kimia berbentuk serbuk dengan massa total 20 gram dicampur di dalam wadah alumina (alumina crucible) dan dibuat dengan metode melt-quenching. Untuk mendapatkan bentuk dan ukuran yang optimum, maka sampel gelas dipotong menjadi tiga ukuran berbeda yakni: 20 x 10 x 3 mm3, 15 x 5 x 3 mm3 dan 10 x 10 x 3 mm3. Selanjutnya gelas dihaluskan untuk memperoleh permukaan yang rata dan transparansi yang tinggi. Untuk mengetahui performa material, maka dilakukan pengukuran dan perhitungan terhadap sifat fisis antara lain: kerapatan, volume molar, indeks bias, konsentrasi ion Nd3+, refraktivitas molar dan suseptibilitas. Sedangkan suhu transisi di dalam gelas diperoleh dengan menggunakan thermo-gravimetric analysis (TGA). Dari hasil pengukuran di peroleh indeks bias gelas meningkat secara bertahap dari 1,570 untuk gelas undoped menjadi 1.625 untuk gelas 4,0 Nd3+. Kerapatan dan volume molar sampel juga meningkat secara perlahan mengikuti kenaikan konsentrasi ion Nd3+.Kata kunci: ion Nd3+,gelas, didoping, sifat fisis.Â AbstractGlasses medium with composition (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O (x = 0,05; 0,1; 0,5; 1,0; 2,0 and 4,0 mol%) doped by xNd2O3 active ion have been successfully prepared. Through the insertion of Nd3+ is expected to obtain the active medium in the form of glass that can be applied as optical amplifier or laser medium for near infrared (NIR) range. The chemical compounds in this work were used in the powder form with 20 gr total mass mixed in the alumina crucible and prepared by melt-quenching method. Then to obtain the optimum uniform, glass samples were cut into three different sizes 20 x 10 x 3 mm3, 15 x 5 x 3 mm3 and 10 x 10 x 3 mm3. Finally, the glasses were polished to get the flat surface and high transparency. The physical parameters such as density, molar volume, refractive indices, Nd3+ ion concentration, molar refractivity and susceptibility are measured for the observed glass material performance. From the measurement results obtained that refractive indices is gradually increased from 1.570 up to 1.625 refer to un-doped glass to 4.0 Nd3+ glass. Also, density and molar volume of the glasses are slightly increased by following increase of Nd3+ ion concentration.Key words: Nd3+ ion, glasses, doped, physical properties.

Alternatif Fondasi Tiang Pancang Pada Gedung Pengendalian Penduduk dan Keluarga Berencana (P2KB) Palu Hidayat, R.; Irdhiani, Irdhiani
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2 Issue 1 (March 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i1.239

The foundation design of Pengendalian Penduduk dan Keluarga Berencana is located on Jl. R.A. Kartini No. 100, Palu City, Central Sulawesi. In field testing using 2-point of (CPT), the value of hard-ground support at 8 – 9 m below the surface and the loads of building structures of 2 (two) floor buildings that work on the foundations are quite large, this is a consideration in choosing the type of used foundation. The point of this design is to obtain the dimensions of the pile foundation and calculate the bearing capacity of the foundation permit and settlement that meet the safety requirements. The calculation for bearing capacity of the foundation is calculated using (CPT) data and soil shear strength parameter data (c and tetha). Single pile is calculation by using the Semi-Empirical method and using Brooms Method for calculating lateral force on the driven piles. The dimensions of the foundation are planned based on the load (Qv) acting on the entire foundation. Calculation of bearing capacity of a single pile with a penetration depth of 8,20 m and varying dimensions are used in the planning. Based on the calculation of the bearing capacity of a single pile using (CPT) data on the load that works on the foundation, was obtained 25 cm and 30 cm diameter of pile. while the calculation uses ground shear strength parameter data (c and tetha) obtained pile diameter of 30 cm and diameter of 35 cm. Based on the calculation of the bearing capacity of a single pile, the dimensions of the foundation and the settlement in permits has reached the safety requirements.

Simulasi tegangan pada pengaruh putaran roda terhadap speed bump menggunakan metode FEM Hidayat, R.; Haryono, M.B.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced

Weighted CTDI Equation for 3D Rotational Angiography: A Monte Carlo Study Azzi, A.; Hidayat, R.; Rosa, A.; Lubis, L. E.
Atom Indonesia VOL 50, NO 1 (2024): APRIL 2024
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/aij.2024.1307

This study aims to verify the weighted Computed Tomography Dose Index (CTDIw) coefficients of 3D rotational angiography (3DRA) procedure using Monte Carlo simulation. The Monte Carlo simulation EGSnrc usercode was employed for 3D dose simulations of the rotational angiography procedure. A virtual phantom resembles the head CTDI phantom was constructed, with a diameter of 16 cm and a density resembling polymethyl methacrylate (1.13 g/cm3). A series of virtual phantoms consisting of 5 images with ionization chamber detectors at the center position, 12 o'clock, 9 o'clock, 6 o'clock, and 3 o'clock were acquired. Simulations were performed with photon sources of 70 and 109 kVp for 200-degree x-ray tube rotation. The field of view was divided into narrow, wide, and full beam with diameters of 1.7 cm; 4.9 cm; and 8.6 cm, respectively. The simulated doses at the ionization chamber were processed into weighting factor for weighted CTDI and compared with direct measurements. The dose ratio between peripheral and center positions for 360° CBCT and 200° 3DRA was 1:1 and 1:3 in this study. The weighting factors for 3DRA were determined as CTDIcenter = ¼ and CTDIperiphery = ¾. The measured average percentage difference of CTDIw between our weighted factor and conventional CTDIw was 1.75 % (-3.99 % to 6.08 %). The x-ray tube position of 3DRA impacted the accuracy of weighting factor of CTDIw, with implications for the proposed weighting factor (Wcenter = ¼ and Wperiphery = ¾) when using a 3DRA machine.

Simulasi tegangan pada pengaruh putaran roda terhadap speed bump menggunakan metode FEM Hidayat, R.; Haryono, M.B.
Dinamika Teknik Mesin Vol 8, No 2 (2018): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v8i2.244

The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced The interaction between tires with road surface is very important because it can reduce the risk of accidents due to damage to the tire. This research was investigated the stress distribution as a result on pressure of tires rolling across speed bump. The research methode used solid work and abaqus application to simulation, the paramaters on research used variation on high speed bump (75mm, 120mm and 160mm) and tires speed (8, 20 and 30kmh). The result showed the higher load recived by tires, the higher stress produced

Exploring How Emotional Service Experience and Responsiveness Satisfaction Drive Purchase Decisions in a Service Context : JEL Classification: M31, M37, D12, L83, C83 Permatasari, Dinda Rahma Novita; Hidayat, R.
Journal La Bisecoman Vol. 6 No. 4 (2025): Journal La Bisecoman
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallabisecoman.v6i4.2533

This study aims to explore the influence of emotional service experience and responsiveness satisfaction on purchasing decisions in a service context, using a case study of Mie Gacoan in 2025. This study used a quantitative approach with a survey method, in which 100 Mie Gacoan customer respondents were selected through purposive sampling. Data were collected using a semantic differential scale ranging from 1 to 7 to measure the variables. Validity and reliability tests were conducted to ensure the accuracy and consistency of the instrument. Furthermore, classical assumption tests, multiple linear regression analysis, and significance tests (t-test and F-test) were conducted to test the hypotheses. The results showed that emotional service experience and responsiveness satisfaction had a positive and significant influence on purchasing decisions, both partially and simultaneously. Emotional service experience emerged as a stronger predictor, highlighting the importance of creating a positive emotional impression in service delivery. Responsiveness satisfaction measured through speed, availability, convenience, and empathy also contributed significantly to driving customer purchasing decisions. This study emphasizes that in highly competitive service industries, such as the food and beverage sector, enhancing emotional aspects and responsiveness of service can substantially improve customer purchasing decisions. These findings provide practical implications for service providers to focus not only on product quality, but also on emotional engagement and responsiveness in interactions with customers.

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