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Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Terumbu Karang Melalui Proses Presipitasi Dengan Variasi Temperatur Dan Waktu Ageing Kayabi, Ulhunk Aulia; Yelmida, Yelmida; Evelyn, Evelyn
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite is a bioceramics that is widely used as a bone and tooth grafting material, catalyst and adsorbent. Hydroxyapatite is a calcium phosphate compound that can be synthesized from natural ingredients with high calcium content such as coral reefs. Coral reef is a marine biota that has a CaCO3 content of 98.8%. This study aims to synthesize hydroxyapatite through the formation of Precipitated Calcium Carbonate (PCC) from coral reefs. The research procedure begins with the process of calcination of coral reefs to form CaO which is then made into PCC with carbonation methods. PCC as a source of calcium is synthesized into hydroxyapatite using precipitation processes with variations in temperature (30°C, 50°C and 70°C) and aging time (7 hours, 14 hours and 21 hours). Synthesized hydroxyapatite was analyzed by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The results of XRD analysis showed the formation of hydroxyapatite compounds from 2 sudut angles in accordance with the data (ICDD 01-074-0565). Hydroxyapatite which was synthesized at a temperature of 50⁰C and aging time gave the best results with a monoclinic crystal structure, a degree of crystallinity of 96.0772% and a crystal size of 20.1846 nm. The resulting hydroxyapatite can be developed as bone implant material, catalyst or adsorbent. Keywords: degree of crystallinity, PCC, temperature, ageing time
EFFECT OF 2008 AND 2016 U.S. PRESIDENTIAL ELECTION IN THE INDONESIAN STOCK MARKET Evelyn, Evelyn; Basana, Sautma Ronni
Jurnal Manajemen dan Kewirausahaan Vol 20, No 1 (2018): MARCH 2018
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.299 KB) | DOI: 10.9744/jmk.20.1.16-22

Abstract

The U.S. Presidential election was an event that received widespread attention across the globe. In the 2008 presidential campaign, Barrack Obama nominated to be the first black President. In 2016, Hillary Clinton poten­tially becomes the first woman President in American history, while the other can­di­da­te, Donald Trump, ma­de some unpopular and controversial proposals. The purpose of this paper is to ana­­­lyse whether the 2008 and 2016 election were considered as the rele­vant information in the Indonesian Stock Market (IDX). The daily closing prices of all all share listed in IDX wo­uld be examined used event stu­­­dy method. The results provide insight about the res­pon­si­­­veness of IDX parti­ci­pants to the U.S. Pre­si­den­­tial election event that could be used in decision making.
Komunikasi Interpersonal Antara Anak Agnostik dengan Orang Tua Beragama Evelyn, Evelyn
Jurnal e-Komunikasi Vol 6, No 1 (2018): VOL 6, NO 1 FEBRUARY 2018
Publisher : Jurnal e-Komunikasi

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Abstract

Agama pada umumnya adalah sesuatu yang diturunkan oleh orang tua kepada anaknya. Idealnya dalam keluarga, seorang anak menganut agama yang sama dengan apa yang dianut oleh orang tuanya. Namun, ada juga anak-anak yang akhirnya memutuskan untuk memilih kepercayaannya sendiri atau bahkan menjadi tidak beragama. Istilah ‘agnostik’ dan ‘ateis’ pun mulai banyak didengar di Indonesia. Penelitian ini meliputi komunikasi antara anak yang memiliki kepercayaan agnostik ateis dengan ibunya yang beragama. Di sini peneliti menemukan bahwa ibu lebih dominan menjadi sumber daripada penerima. Adanya hambatan psikologi, semantik, dan akibat perbedaan generasi dalam mempengaruhi komunikasi. Hasil dari penelitian mengungkapkan mengenai bagaimana komunikasi serta relasi yang dimiliki oleh anak (perempuan) dan orang tua (ibu) yang mememiliki perbedaan kepercayaan dari segi komunikasi interpersonal, elemen komunikasi interpersonal, fungsi keluarga, dan pengaruh perbedaan pola pikir antar generasi dalam komunikasi interpersonal.
PENGARUH DUKUNGAN SOSIAL TERHADAP POLA PENGASUHAN ORANG TUA ANAK BERUSIA MIDDLE CHILDHOOD DARI KELUARGA MISKIN Evelyn, Evelyn; Savitri, Luh Surini Yulia
Jurnal Psikologi Ulayat: Indonesian Journal of Indigenous Psychology Vol 2, No 2 (2015): Jurnal Psikologi Ulayat
Publisher : Konsorsium Psikologi Ilmiah Nusantara (KPIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (292.14 KB) | DOI: 10.24854/jpu22015-38

Abstract

Abstract — This study aimed to determine the effect of social support on parenting style of middle childhood parents from poor families. A total of 78 parents were involved in the study by completing questionnaires to measure social support and parenting style. Social support was measured by using Multidimensional Scale of Perceived Social Support from Zimet et al. (1988), whereas parenting styles were measured by using Parenting Style Development Questionnaire Short Version from Robinson et al. (1995). In this study, 74 participants were found to apply authoritative parenting style, two applied authoritarian parenting style, and two others applied permissive parenting style. The result of this study indicates that social support has no significant effect on both authoritative and permissive parenting style. In contrast, social support affects authoritarian parenting style significantly. Abstrak — Penelitian ini bertujuan untuk melihat pengaruh dukungan sosial terhadap pola pengasuhan orang tua yang memiliki anak berusia middle childhood dari keluarga miskin. Sebanyak 78 orang menjadi partisipan dalam penelitian ini dengan mengisi kuesioner untuk mengukur variabel dukungan sosial dan pola pengasuhan. Variabel dukungan sosial diukur menggunakan alat ukur Multidimensional Scale of Perceived Social Support oleh Zimet dkk., (1988), sedangkan variabel pola pengasuhan diukur menggunakan alat ukur Parenting Style Development Questionnaire Short Version oleh Robinson dkk., (1995). Pada penelitian ini, sebanyak 74 partisipan menerapkan pola pengasuhan authoritative, dua menerapkan pola pengasuhan authoritarian, dan dua menerapkan pola pengasuhan permissive. Hasil penelitian menunjukkan bahwa dukungan sosial tidak mempunyai pengaruh signifikan terhadap pola pengasuhan authoritative dan permissive, Sebaliknya, dukungan sosial mempengaruhi pola pengasuhan authoritarian secara signifikan.
Aklimatisasi Bakteri Rumen Sapi Pada Pengolahan Palm Oil Mill Effluent Maulani, Annisa; Andrio, David; Evelyn, Evelyn
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm oil mill effluent (POME) has high chemical oxygen demand (COD) content of 44.444 mg/L causing the most suitable processing technology is anaerobic digestion. This research aimed to study soluble COD removal efficiency and bacteria growth rate as VSS in acclimatization process of rumen fluid as inoculum addition in POME treatment. Acclimatization I was conducted in circulating bed reactor (CBR) with working volume 20 L, ratio of glucose : POME inside the reactor is 50% : 50% (%v/v). Meanwhile, acclimatization II was conducted in upflow anaerobic sludge blanket (UASB) with working volume 10 L, ratio of glucose : POME inside the reactor is 0% : 100% (%v/v). Acclimatization I and II was done in 20 and 50 days with soluble COD removal efficiency 80,36% and 65,41%, respectively. Meanwhile, bacteria growth rate as VSS has amount of 277 mg/L/day and 429 mg/L/day, respectively.Keywords: palm oil mill effluent, acclimatization, mixed culture bacteria, glucose, soluble COD, VSS
Inaktivasi Termal Spora Jamur Eupenicillium Javanicum Dalam Jus Nanas Adella, Lufya; Evelyn, Evelyn; Muria, Sri Rezeki
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Eupenicilium Javanicum is a mold that has high heat resistance. The purpose of this study was to determine the effect of temperature (T: 80 ° C, 85 ° C, 90 ° C) at soluble solid SS: 10 ° Brix on the thermal inactivation of E. Javanicum spores. Then determine the value of D and Z. This study uses the thermal method of pasteurization process and spore calculation using the spread plate method. The D-values obtained at SS 10 ° Brix for temperatures 80, 85 and 90 ° C were 10.82; 4.63; and 1.45 minutes and the Z-value obtained is in the at 11,47 ° C. It was shown that haiger temperature resulted in the decreasing of the timeneeded to inactivate the spores. The results of this study emphasize the importance of temperature to the D and Z value for pineapple juice pasteurization.Keywords: Ascospore, Inactivation, Pasteurization, Pineapple juice, E. Javanicum.
PENGARUH PERUBAHAN PENJUALAN, ASSET INTENSITY, PROFITABILITY, SIZE, DAN LEVERAGE TERHADAP COST STICKINESS Evelyn, Evelyn
Jurnal Muara Ilmu Ekonomi dan Bisnis Vol 2, No 2 (2018): Jurnal Muara Ilmu Ekonomi dan Bisnis
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmieb.v2i2.1609

Abstract

This study aims to obtain empirical evidence on the effect of changes in sales, asset intensity, profitability, firm size, and debt level to cost stickiness on all companies listed in Indonesia Stock Exchange in period 2012-2016. The number of sample companies used in this study is 150 companies. The results of this study indicate that on the net sales condition increased, the increase of SGA cost is higher than the decrease of SGA cost at the time of net sales decrease, asset intensity have a significant positive effect to cost stickiness, profitability has no significant effect on cost stickiness, firm size has no effect significant to the cost stickiness, and the level of debt has a significant negative effect on the cost stickiness.  Keyword: Cost Stickiness, Asset Intensity, Profitability, Sales changes and SizeThis study aims to obtain empirical evidence on the effect of changes in sales, asset intensity, profitability, firm size, and debt level to cost stickiness on all companies listed in Indonesia Stock Exchange for 2012-2016 period. The number of sample companies used in this study are 150 companies. The result of this study indicates that on the condition of net sales increase, the increase of SGA cost is higher than the decrease of SGA cost at the time of net sales decrease, asset intensity has a significant positive effect on cost stickiness, profitability has no significant effect on cost stickiness, firm size has no significant effect on cost stickiness, and debt level has a significant negative effect on cost stickiness.Keywords: Cost Stickiness, Asset Intensity, Profitability, Sales Changes, Firm Size
FINANCIAL KNOWLEDGE, FINANCIAL WELLBEING, AND ONLINE SHOPPING ADDICTION AMONG YOUNG INDONESIANS Tanoto, Sherly; Evelyn, Evelyn
Jurnal Manajemen dan Kewirausahaan (Journal of Management and Entrepreneurship) Vol 21, No 1 (2019): MARCH 2019
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (361.664 KB) | DOI: 10.9744/jmk.21.1.32-40

Abstract

With the recent booming of e–commerce business in Indonesia, it is essential to conduct further studies on online shopping behavior of Indonesians. Past studies on online shopping addiction emphasize only psychological factors and overlook financial factors. To fill this research gap, this study aims to examine the association and effect of financial knowledge and financial wellbeing on online shopping addiction. The Bergen Shopping Addiction Scale (BSAS) was adopted to assess online shopping addiction whilst financial knowledge and financial wellbeing scales from Australian Unity were used to measure the other two research variables. Data was collected through an online survey of 230 young Indonesians. To analyze the data, Pearson correlation and multiple regression techniques were implemented. Outcomes of this study revealed that most respondents had medium and high levels of financial knowledge and financial wellbeing. Interestingly, addictive respondents showed high financial knowledge and financial wellbeing. Financial knowledge and financial wellbeing were positively related to online shopping addiction. Financial wellbeing was a better predictor because it might be possible that individuals with positive feelings on their financial conditions were more comfortable in increasing their online spending behavior. The results of this study provide insights for future studies and e–commerce owners.Keywords: Online shopping addiction, financial knowledge, financial wellbeing.
Pengaruh dukungan sosial terhadap pola pengasuhan orang tua anak berusia middle childhood dari keluarga miskin Evelyn, Evelyn; Savitri, Luh Surini Yulia
Jurnal Psikologi Ulayat: Indonesian Journal of Indigenous Psychology Vol 2 No 2 (2015)
Publisher : Konsorsium Psikologi Ilmiah Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24854/jpu35

Abstract

This study aimed to determine the effect of social support on parenting style of middle childhood parents from poor families. A total of 78 parents were involved in the study by completing questionnaires to measure social support and parenting style. Social support was measured by using Multidimensional Scale of Perceived Social Support from Zimet et al. (1988), whereas parenting styles were measured by using Parenting Style Development Questionnaire Short Version from Robinson et al. (1995). In this study, 74 participants were found to apply authoritative parenting style, two applied authoritarian parenting style, and two others applied permissive parenting style. The result of this study indicates that social support has no significant effect on both authoritative and permissive parenting style. In contrast, social support affects authoritarian parenting style significantly.
POTENSI EKSPANSIF PADA TANAH RESIDUAL DENGAN ATTERBERG LIMIT DAN X-RAY DIFFRACTION TEST UNTUK WILAYAH JAKARTA DAN SEKITARNYA Evelyn, Evelyn; Makarim, Chaidir A
JMTS: Jurnal Mitra Teknik Sipil Volume 1, Nomor 1, Agustus 2018
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v1i1.2293

Abstract

Tanah residual adalah tanah yang mengalami perubahan secara fisika dan kimia serta pengendapan pada tempat aslinya. Tanah ini kerap dikaitkan dengan potensi ekspansif yang dapat menyebabkan kerugian besar terutama pada infrastruktur di Indonesia. Sifat ekspansif perlu diantisipasi dengan pengujian tanah sebelumnya. Pengujian Atterberg Limit serta X-Ray Diffraction, menghasilkan nilai indeks plastisitas dan kandungan mineral yang dapat  digunakan sebagai acuan analisa potensi ekspansif pada tanah. Pada penelitian ini pengujian dilakukan untuk mengetahui potensi ekspansif pada tanah residual di Jakarta dan sekitarnya, juga untuk mengetahui korelasi padanan antara nilai indeks plastisitas dengan kandungan mineral montmorillonite. Hasilnya dijumpai sampel dengan nilai indeks plastisitas yang tinggi tanpa mineral montmorillonite di dalamnya, sebaliknya dengan keberadaan kaolinite yang terdapat pada sampel dengan nilai IP yang tinggi. Hal ini menunjukkan bahwa keberadaan nilai indeks plastisitas yang tinggi tidak selalu bersamaan dengan kehadiran mineral montmorillonite. Selain itu, mineral kaolinite yang kerap dikaitkan dengan keberadaan potensi ekspansif sesungguhnya bukanlah mineral penyebab ekspansif. Kaolinite hanya dapat menjadi indikator nilai indeks plastisitas yang tinggi, namun bukan sebagai acuan sifat ekspansif, melainkan montmorillonite memiliki nilai aktivitas tinggi. Sebagai contoh diberikan analisa runtuhnya struktur pada salah satu underpass Bandara Internasional Soekarno Hatta, Tangerang. Kerusakan struktur akibat sifat ekspansif, dan keberadaan muka air tanah yang terlalu tinggi tidak hanya dapat merusak struktur bangunan, namun juga memakan korban jiwa.