7 research outputs found

    Comparison Study of Caffeine Levels of Coffee Bean (Coffea Sp.) and Brands of Coffee Powder Circulate in Banda Aceh City

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    Coffee is one of the plantation commodities that has a fairly high economic value compared to other plantation crops and plays an important role as a source of foreign exchange for the country. Caffeine belongs to the methylxanthine group of compounds. Methylxanthine is a naturally occurring compound and belongs to the xanthine derivative which is a group of alkaloid compounds. To determine the difference in caffeine content between coffee beans and coffee grounds circulating in supermarkets in Banda Aceh. This type of research is a descriptive method with a purposive sampling method used. This research was carried out by analyzing the levels of caffeine in coffee beans and packaged coffee powder circulating in supermarkets in the city of Banda Aceh by UV-Vis Spectrophotometry. The results obtained from the manufacture of standard solutions are 273,20 nm, the correlation coefficient value is r of 0.99995, and the equation y = 0.0483x + 0.01098. From the research data obtained caffeine levels, namely samples of Robusta coffee beans with 0.305%, samples of Meulawi Coffee powder with 0.402%, samples of Arabica Coffee beans with 0.815%, samples of Solong Coffee powder with 1.498%, samples of King Coffee coffee powder with 2.256%. The highest level is in King Coffee powder with 2.256% and the lowest is boiled coffee beans with 0.305%. The difference in caffeine content of each coffee sample is caused by various factors, namely the method of roasting, storage, and treatment

    Activity Of A Gel Combination Of Pandan Wangi (Pandanus amaryllifolius Roxb) and Snail Mucus (Achatina Fulica) On Burn Wounds In Male White Rats (Rattus Norvegicus) Wistar Strains

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    Burns are damage to skin tissue due to thermal trauma. This research aimed to determine the combination of Pandan Wangi and snail mucus used to treat burns and determine the optimal formula. The research was pure with only a randomized control design, including F1 being given placebo gel, F1 (10%:10%), F2 (10%:15%), F3 (10%:20%), and F4 being given bioplacenton. The gel evaluation and tested for the ability to treat burns on rats for about 21 days. The combination gel made a homogenous formulation with a pH 6 based on pH paper while pH meter results were around 6,27- 6,35 cm, a spread of 5,70-6,60 cm, and a viscosity value of 5.600-7.600 cps that was stable for 3 weeks of storage. This evaluation’s findings are consistent with the provisions of National Standard Indonesia (SNI). The activity optimal combination gel obtained by examining the average diameter and discoloration were 10%:20% (0,5560 cm), 10%:15% (0,8120 cm), 10%:10% (0,9860 cm), bioplacenton (0,4780 cm), and placebo gel (1,5340 cm). On the 21st day, the skin condition of K1, K2, K3, and K4 was normal, however, K0 was not normal. The statistical analysis data is normally distributed (p≥0,05), homogeneous (p≥0,05), and a significant difference in all groups (p0,05). According to the experiment, three gel combination of Pandan Wangi and snail mucus have an effect on healing burns but 10%:20% (F3) could accelerate the optimal healing process

    Effect of halide-mixing on tolerance factor and charge-carrier dynamics in (CH3NH3PbBr3-xClx) perovskites powders

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    The authors are highly thankful for the financial support of Higher Education Commission (HEC) Pakistan through the equipment/research grants (6976/Federal/NRPU/R&D/HEC/2017), (20-3071/NRPU/R&D/HEC/13). Author ZS acknowledges HEC for indigenous PhD Fellowship Phase-II, Batch-II, 2013, PIN 213-66018-2PS2-127 and International Research Support Initiative Programme (IRSIP). Author LKJ acknowledges support from a Marie Skłodowska-Curie Individual Fellowship (European Commission) (MCIF: No. 745776).This work demonstrates a route to making mixed halide perovskite powders at room temperature by the anti-solvent-assisted crystallization method. Although, mixed halide CH3NH3PbBr3−xClx perovskites have been prepared by different methods, however, to the best of our knowledge the anti-solvent-assisted crystallization method is employed here for the first time to prepare mixed halide CH3NH3PbBr3−xClx perovskite powders. Solution-processed methyl ammonium lead tribromide CH3NH3PbBr3 (x = 0) and different amounts of chloride (Cl) containing mixed halide perovskites (CH3NH3PbBr3−xClx) were prepared for compositions of x = 0.5, 1, 1.25, 1.75. It reveals that bulk CH3NH3PbBr3−xClx samples are highly crystalline and exists in pure single cubic phase with an increased tolerance factor as compared to pure CH3NH3PbBr3. The CH3NH3PbBr3 perovskite has space-group Pm-3 m and a cell parameter of 5.930 Å (volume = 206 Å). The synthesis route adopted here gives access to hybrid perovskites powders with high Cl content and hence enables the band gap to be precisely tuned over a range from 2.26 to 2.49 eV. The powder samples display the subtle shifts in the emission spectra and the photoluminescence kinetics exhibits a decrease in average lifetime by increasing the Cl contents due to the presence of trap states in the structures that encourage non-radiative recombination of charge carrier. Conventionally, the CH3NH3PbBr3-based inverted solar cell architecture is prepared via mixing of the CH3NH3Br and PbBr2 precursors. In contrast, herein, the precursor solutions are directly prepared from the CH3NH3PbBr3 powder and the active layer of the inverted perovskite solar cells are then spin coated using this solution. The high Voc value of the fabricated solar cells potentially makes it a promising candidate for tandem photovoltaic, photocatalytic water splitting, and semi-transparent photovoltaic applications.PostprintPostprintPeer reviewe


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    Penelitian ini bertujuan untuk menguji pengaruh Kapasitas Sumber Daya Manusia, Pemanfaatan Teknologi Informasi, dan Peran Auditor Internal terhadap Kualitas Pelaporan Keuangan Pemerintah Daerah. Populasi yang digunakan dalam penelitian ini adalah 44 Satuan Kerja Perangkat Kota (SKPK) yang berada di Kota Banda Aceh. Responden pada penelitian ini adalah pegawai yang melakukan fungsi akuntansi atau tata usaha keuangan yang terdiri dari Kepala Subbagian Keuangan, Bendahara Penerimaan, Bendahara Pengeluaran, dan Staf bagian Keuangan dari masing-masing SKPK. Metode pengumpulan data dalam penelitian ini menggunakan teknik kuesioner. Uji validitas menggunakan uji korelasi Pearson Correlation, sedangkan uji reliabilitas menggunakan Cronbach's Alpha. Teknik analisis data yang digunakan adalah analisis regresi berganda dengan bantuan software IBM SPSS versi terbaru. Hasil penelitian ini menunjukkan bahwa (1) Kapasitas Sumber Daya Manusia, Pemanfaatan Teknologi Informasi, dan Peran Auditor Internal secara simultan berpengaruh terhadap Kualitas Pelaporan Keuangan Pemerintah Daerah, (2) Kapasitas Sumber Daya Manusia tidak berpengaruh signifikan terhadap Kualitas Pelaporan Keuangan Pemerintah Daerah, (3) Pemanfaatan Teknologi Informasi berpengaruh positif terhadap Kualitas Pelaporan Keuangan Pemerintah Daerah, (4) Peran Auditor Internal tidak berpengaruh signifikan terhadap Kualitas Pelaporan Keuangan Pemerintah Daerah

    Synthesis and optical characterization of lead-free phenylenediammonium bismuth halide perovskites:a long charge carrier lifetime in phenylenediammonium bismuth iodide

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    Funding: ZS acknowledges Higher Education Commission (HEC) of Pakistan for indigenous PhD Fellowship Phase-II, Batch II, 2013, PIN 213-66018-2PS2-127 and International Research Support Initiative Programme (IRSIP). She also acknowledges a British council of Pakistan for Pakistan Scottish PhD Research Travel Grants for Women 2017–18. JLP thanks the University of St Andrews for funding and the Carnegie Trust for a Research Incentive Grant (RIG008653). We thank EPSRC for funding (EP/P007821/1).Toxicity and regulatory concerns over the use of (CH3NH3)PbI3 in photovoltaic devices have resulted in significant interest in lead-free, organic–inorganic metal halides with excellent light absorbing properties and stability. Here we report the synthesis of three new lead-free bismuth halides which accommodate the symmetric conjugated p-phenylenediammonium cation (PPD = (H3NC6H4NH3)2+) in the structures. These are (PPD)BiI5, (PPD)[BiBr4]2·2H2O and (PPD)2BiCl7·H2O. We also synthesized β-(PPD)2Bi2I10. The band gap of the iodide, β-(PPD)2Bi2I10 (1.83 eV) is lower than that of the bromide, (PPD)[BiBr4]2·2H2O (2.64 eV) and chloride, (PPD)2BiCl7·H2O (2.93 eV). Photophysical studies show that β-(PPD)2Bi2I10 has the longest average charge carrier lifetime (>1 μs) of the materials studied here, of the same order of magnitude as that of (CH3NH3)PbI3 and has a low band gap. This suggests that β-(PPD)2Bi2I10 may be a promising candidate for use in lead-free photovoltaic devices.PostprintPeer reviewe

    CCDC 2180531 - 2180533: Experimental Crystal Structure Determination

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    An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures