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Quantitative Analysis of Liquid by Quick Freezing Into Ice Using Nd-YAG Laser-Induced Atmospheric Plasma Yulianto Ichwan, Mohamad Infrawan; Suyanto, Hery; Suliyanti, Maria Margaretha; Hedwig, Rinda; Pardede, Marincan; Kagawa, Kiichiro; Lie, Tjung Jie; Kurniawan, Koo Hendrik
Journal of Engineering and Technological Sciences Vol 37, No 1 (2005)
Publisher : ITB Journal Publisher, LPPM ITB

A new approach of quantitative analysis of liquid sample using laser ablation technique was developed. The liquid was immediately freezed using the mixture of dry ice and alcohol in weight ratio of 95% : 5%. As a result, an increase of the repulsion force from the sample surface will enable the generation of the laser-induced shock wave plasma which was difficult to carry out on liquid surface. The ice sample was then irradiated using Nd-YAG laser operated in its fundamental wavelength. In order to increase the signal to background ratio and to obtain a sharp atomic line spectra, helium gas was used instead of air. Dynamic characterization of the spatially integrated time profile of the Cu I 521.8 nm, Cu I 510.5 nm and HÎ± lines shows a shock excitation stage and cooling stage which is corresponded to our shock wave model even when the plasma was generated under atmospheric gas pressure. Further study of the time profile averaged temperature of the atmospheric plasma also shows an increase of temperature during the shock excitation stage followed by diminution of temperature during the cooling stage. An application of this technique was then applied to quantitative analysis of several liquid samples. A linear calibration curve which intercept at 0 point was obtained for all of the elements investigated in this study such as sodium, potassium, lithium, copper, silver, lead and aluminum. A detection limit of around 1 ppm was found for the above element. This new technique will contribute to a great extent of laser atomic emission spectrochemical analysis for liquid samples.

Quantitative Analysis of Liquid by Quick Freezing Into Ice Using Nd-YAG Laser-Induced Atmospheric Plasma Mohamad Infrawan Yulianto Ichwan; Hery Suyanto; Maria Margaretha Suliyanti; Rinda Hedwig; Marincan Pardede; Kiichiro Kagawa; Tjung Jie Lie; Koo Hendrik Kurniawan
Journal of Engineering and Technological Sciences Vol. 37 No. 1 (2005)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2005.37.1.4

A new approach of quantitative analysis of liquid sample using laser ablation technique was developed. The liquid was immediately freezed using the mixture of dry ice and alcohol in weight ratio of 95% : 5%. As a result, an increase of the repulsion force from the sample surface will enable the generation of the laser-induced shock wave plasma which was difficult to carry out on liquid surface. The ice sample was then irradiated using Nd-YAG laser operated in its fundamental wavelength. In order to increase the signal to background ratio and to obtain a sharp atomic line spectra, helium gas was used instead of air. Dynamic characterization of the spatially integrated time profile of the Cu I 521.8 nm, Cu I 510.5 nm and HÎ± lines shows a shock excitation stage and cooling stage which is corresponded to our shock wave model even when the plasma was generated under atmospheric gas pressure. Further study of the time profile averaged temperature of the atmospheric plasma also shows an increase of temperature during the shock excitation stage followed by diminution of temperature during the cooling stage. An application of this technique was then applied to quantitative analysis of several liquid samples. A linear calibration curve which intercept at 0 point was obtained for all of the elements investigated in this study such as sodium, potassium, lithium, copper, silver, lead and aluminum. A detection limit of around 1 ppm was found for the above element. This new technique will contribute to a great extent of laser atomic emission spectrochemical analysis for liquid samples.

LOKAKARYA FUN LEARNING DENGAN FLOW, GRIT & GROWTH MINDSET [FUN LEARNING WORKSHOP WITH FLOW, GRIT & GROWTH MINDSET] Ihan Martoyo; Marincan Pardede; Julinda Pangaribuan; Mario Gracio A. Rhizma; Henri Putra Uranus; Junita Junita; Herman Kanalebe; Rocky T. Putra; Heri Yulian; Rianto Mangunsong; Rosmaya Nainggolan
Jurnal Sinergitas PKM & CSR Vol 3, No 1 (2018): October
Publisher : Universitas Pelita Harapan

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

Three theories in educational psychology: (1) Flow (Mihaly Csikszentmihalyi), (2) Grit (Angela Duckworth), dan (3) Growth mindset (Carol Dweck) open the possibility for fun learning. Flow according to Csikszentmihalyi happens when the challenge in an activity is balanced with the necessary skill, so that one can experience flow during the activity. This feeling of flow is actually what makes learning fun. The concept of grit consists of two components: (1) perseverance and (2) passion for long term goals. Duckworth discovered that grit can predict success better than mere intellect (IQ). Growth mindset is a psychological state where one is not afraid to look stupid and therefore is more open to challenges because he/she focuses more on the learning process rather than momentary results. In the workshop in one private school in Tangerang, the three concepts were explained with concrete examples from movies and other illustrations. Furthermore, we did a demonstration in optical physics with simple equipments to simulate natural phenomena: A rainbow, the red evening sky, and laser deflection due to refractive index difference. Pre-test and post-test results after the fun learning workshop show that the concept of flow and grit is easier to comprehend by the teachers than growth mindset. After the workshop, there is an increase in the opinion that math and physic lessons can also be fun.

Lokakarya Fun Learning Bersama Sma Favorit Di Jakarta: Teori Grit Dan Growth Mindset Lebih Sulit Dari Flow Ihan Martoyo; Mario Gracio A. Rhizma; Rocky T. Putra; Rianto Mangunsong; Heri Yulian; Marincan Pardede; Junita Junita; Julinda Pangaribuan; Henri P. Uranus; Herman Kanalebe
Prosiding Konferensi Nasional Pengabdian Kepada Masyarakat dan Corporate Social Responsibility (PKM-CSR) Vol 2 (2019): Peran Perguruan Tinggi dan Dunia Usaha dalam Mempersiapkan Masyarakat Menghadapi Era I
Publisher : Asosiasi Sinergi Pengabdi dan Pemberdaya Indonesia (ASPPI)

Program Studi Teknik Elektro Universitas Pelita Harapan secara berkala melakukan lokakarya bersama berbagai sekolah untuk membagikan konsep fun learning, yang bertumpu pada 3 teori psikologi: teori flow, teori grit dan teori growth mindset. Walaupun proses pembelajaran modern sudah melibatkan banyak teknologi digital, kualitas pembelajaran itu sendiri diyakini lebih ditentukan oleh teori psikologi yang diterapkan daripada teknologi yang dipakai. Lokakarya kali ini dilakukan bersama guru-guru dari sebuah SMA favorit di Jakarta. Konsep fun learning yang dipresentasikan dilanjutkan dengan diskusi tentang kesulitan menerapkan konsep-konsep tersebut dalam aktivitas belajar yang sesungguhnya. Selain itu, dalam lokakarya juga dilakukan demonstrasi konsep-konsep fisika optik dengan laser dan kotak cahaya sederhana. Demonstrasi dengan peralatan sederhana ini diharapkan dapat dimanfaatkan untuk pembelajaran yang menyenangkan. Diskusi dengan para guru menunjukkan bahwa konsep grit dan growth mindset lebih sulit dipraktikkan dibandingkan konsep flow. Hasil pre-test dan post-test juga menunjukkan bahwa konsep flow lebih mudah ditangkap daripada teori grit dan growth mindset.

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