Articles

Found 3 Documents
Search

Sensitization of Xanthophylls-Chlorophyllin Mixtures on Titania Solar Cells Kartini, Indriana; Dwitasari, L.; Wahyuningsih, T. D.; Chotimah, Chotimah; Wang, L.
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.743 KB) | DOI: 10.12777/ijse.8.2.109-114

Abstract

Co-sensitization of natural dyes on TiO2 for dye-sensitized solar cell (DSSC) was proposed between chlorophyllin (C) and xanthophylls (X at various volume ratios of C/X. Chlorophyllin is chlorophyll derivative providing -COOH groups essential for binding to TiO2. The chlorophyll was extracted from dried spinach (amaranthus viridis) leaves in a mixture of methanol-acetone (70%:30%). Chlorophyll extract dye was obtained after partition of the crude extracts in diethyl ether solution. Then, it was hydrolyzed under alkaline condition to get chlorophyllin. Xanthophyll was extracted from fresh petal of chrysanthemum (chrysanthemum indicum) flowers. Blending of chlorophyllin and xanthophyll was carried out at various volume ratios of C to X (1:0, 5:1, 1:1, 1:5, 0:1). Titania solar cells were constructed in sandwich system of conducting glass-titania/dyes as the photoanode and conducting glass-platinum as the photocathode. Electrolyte solution containing I-/I3- was inserted between the electrodes by capillary action. All dye extracts and blending solutions were analyzed by UV-Vis spectrophotometer. It is shown that the absorption spectra of blending dyes are complimentary in the visible region resulted in a panchromatic response of the dyes. From the cyclic voltammogram of the dyes and blended-dyes, it is found that the energy level of xanthophyll is the lowest. The I-V test at 100 mw/cm2 irradiation confirmed that the energy conversion efficiency (h) of the blended dyes of xanthophyll and chlorophyllin-sensitized solar cell resulted in significant improvement than those of the single dye. Beneficially, the mixed dyes can be adsorbed from solution blend using single dipping step.
Analisis Penerapan Akuntansi Pertanggungjawaban Sebagai Alat Ukur Kinerja Manajerial Pada KSU Dhanadyaksa Jatim Tahun 2012-2014 Chotimah, Chotimah; Sulistyo, Sulistyo; Mustikowati, Rita Indah
Jurnal Riset Mahasiswa Akuntansi Vol 4 No 1 (2016): April
Publisher : Fakultas Ekonomi Universitas Kanjuruhan Malang

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

Abstract

Penelitian ini bertujuan untuk melihat pengaruh penerapan akuntansi pertanggungjawaban sebagai alat ukur kinerja manajer pada KSU Dhanadyaksa Jatim tahun 2012-2014. Jenis penelitian ini adalah deskriptif kualitatif dan deskriptif kuantitatif. Populasi dalam penelitian ini yaitu 105 anggota aktif KSU Dhanadyaksa Jatim. Penarikan sampel dilakukan dengan menggunakan Purpossive Sampling. Jumlah sampel minimal sebesar 80 sampel. Kategori responden yang diteliti, ditentukan minimal responden berpendidikan SMA keatas, dan hanya 43 kuesioner yang layak dan memenuhi syarat dengan berpendidikan minimal SMA untuk diteliti lebih lanjut. Teknik pengumpulan data dalam penelitian ini yaitu menggunakan kuesioner, wawancara, dokumentasi dan studi kepustakaan. Definisi operasional yang digunakan dalam penelitian ini adalah akuntansi pertanggungjawaban (X) dan kinerja manajer (Y). Hasil penelitian menunjukkan bahwa Akuntansi pertanggungjawaban pada KSU Dhanadyaksa sudah baik dilihat dari syarat-syarat akuntansi pertanggungjawaban yang telah diterapkan. Sedangkan kinerja manajer berdasarkan karakteristik akuntansi pertanggungjawaban pada KSU Dhanadyaksa Jatim bisa dikatakan belum berjalan dengan optimal. Hal tersebut dapat dilihat dari pusat pertanggungjawaban telah dilaksanakan namun manajer bertanggungjawab atas seluruh pusat-pusat pertanggungjawaban tersebut. Standar realisasi pinjaman merupakan tanggungjawab manager secara penuh, sedangkan marketing lebih ditekankan untuk mengatasi kredit macet pada anggota. RAPB yang dibebankan kepada manajemen dari tahun 2012 sampai 2014 realisasi pendapatan KSU Dhandyaksa Jatim tidak mencapai target. Sedangkan untuk biaya KSU Dhandyaksa Jatim dari tahun 2012 sampai 2013 hampir selalu tidak dapat terealisasi. Pemberian penghargaan belum diterapkan secara optimal dan menyeluruh dan hanya diberikan kepada manajer saja. Sedangkan hukuman yang pernah diberikan kepada karyawan yaitu teguran dan surat peringatan, Variabel akuntansi pertanggungjawaban berpengaruh positif dan signifikan terhadap kinerja manajer.
Determinants of Stock Return: A Comparison of Financial Distress and Non Financial Distress Firms in Manufacturing Company Listed of Indonesia Stock Exchange Chotimah, Chotimah; Wulansari, Wulansari
Media Riset Bisnis & Manajemen Vol 18, No 2 (2018): Media Riset Bisnis & Manajemen
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/mrbm.v18i2.5048

Abstract

AbstractPurpose ?The purpose of this study is to examine the difference of stock return between financial distress and non-financial distress firms and to examine the influence of financial health, financial leverage, liquidity, profitability, book to market equity and size to stock return on the manufacturing firms listed at Indonesia Stock Exchange in the period 2012-2016.Design/Methodology/Approach- The dependent variable in this study is the stock return (SR), while the independent variable are financial health, financial leverage, liquidity and profitability while the variable control are book to market equity and size. The method used is a non-parametric difference test using mann-whitney U and multi-regression panel data with dummy variable using fixed effect model.Findings - The findings obtained this study indicate that there is difference of stock return between financial distress and non-financial distress company, financial distress and financial leverage has a negative influence to stock return and there is positive influence profitability and size to stock return, while liquidity and book to market equity has no impact on stock return. The firms need to increase the level of financial health and increase corporate profits by reduce the level of corporate debt so it will increase the stock return.