다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

A comprehensive study on prospects of economy, environment, and efficiency of palm oil biodiesel as a renewable fuel

Review of green diesel production from fatty acid deoxygenation over Ni-based catalysts

Natural Dye Extracted From Saraca asoca Flowers as Sensitizer for TiO2-Based Dye-Sensitized Solar Cell

Gel polymer electrolyte system based on starch grafted with ionic liquid: Synthesis, characterization and its application in dye-sensitized solar cell

Biodiesel production from palm olein: A sustainable bioresource for Nigeria.

Dye-sensitized
solar cells (DSSC) were fabricated with mango leaf dye extracts as natural dye
sensitizers at pH value of 5.20 and temperature of 18.1°C. Methanol was used as
dye-extracting solvent. DSSCs from dye extract of M. indica L. with KMnO4 electrolyte had the highest photocurrent density of 1.3 mA/cm2 and
fill factor FF of 0.46 for the sun at its peak. Potassium permanganate (KMnO4)
had a photocurrent density of 1.3 mA/cm2 and FF of 0.8 at sundown.
Potassium Iodide (KI), Potassium Bromide (KBr) and Mercury Chloride (HgCl2)
electrolytes had 0.2 mA/cm2, 0.08 mA/cm2 and 0.02 mA/cm2 photocurrent densities respectively. The fill factors of 0.09, 0.03 and 0.003
respectively for sun overhead while 0.08 mA/cm2, 0.01 mA/cm2 and 0.01 mA/cm2 were the values of photocurrent densities
respectively at sundown. The fill factors were 0.02, 0.0006 and 0.003
respectively at sundown. The maximum power Pmax of the DSSCs were
0.5 mW/cm2, 0.10 mW/cm2, 0.01 mW/cm2 and 0.012
mW/cm2 respectively at 1300 h at 1630 h 0.9 mW/cm2, 0.14
mW/cm2, 0.005 mW/cm2 and 0.0015 mW/cm2 respectively.

/pdf/the-effect-of-electrolyte-on-dye-sensitized-solar-cells-3cr1dbzukp.pdf

The Effect of Electrolyte on Dye Sensitized Solar Cells Using Natural Dye from Mango (M. indica L.) Leaf as Sensitizer

The activity concentration of 238U, 232Th and 40K in the soils of mining and living areas of Ijero Ekiti were determined using hyper pure germanium gamma ray spectrometer. The mean concentrations of 238U, 232Th and 40K were found to be 128.05 Bqkg−1, 24.8 Bqkg−1 and 455.05 Bqkg−1, respectively, for mining areas, while it was found to be 42.02 Bqkg−1, 43.27 Bqkg−1 and 635.41 Bqkg−1, respectively, for the living areas. The mean absorbed dose rate, annual effective dose equivalent, gamma index and the excess lifetime cancer risk evaluated for the locations were 89.70 nGyh−1, 0.11 mSvy−1 and 1.4 for mining areas; while it was 72.22 nGyh−1, 0.089 mSvy−1 and 1.14 for living areas, respectively. The absorbed dose rate, annual effective dose equivalent and gamma index estimated for the mining site were higher than the living areas. The mean excess lifetime cancer risk estimated for the mining areas was consecutively higher than the recommended limit of 0.29 × 10−3 for background radiation. It is therefore...

https://www.tandfonline.com/doi/pdf/10.1080/23311916.2019.1586271

Radiation dose assessment of soil from Ijero Ekiti, Nigeria

Fresh leaves of oil bean (P. macrophylla) were used as sensitizers for fabrication of dye sensitized solar cells (DSSCs) at four dye pH values of 2.58°C at 23.7°C, 2.62°C at 22.2°C, 2.65°C at 22.3°C and 3.61°C at 22.1 °C. The methanol extracts of P. macrophylla were extracted and used as sensitizers for the development of dye sensitized solar cells. The solar cells sensitized by P. macrophylla leaf extracts realised up to short circuit current (Jsc) 0.16 mA/cm2, open circuit voltage (Voc) 0.045 V, Pmax 0.031 mW/ cm2 and fill factor (FF) 0.50. The energy conversion efficiency (η) of the DSSCs is 0.43%. Phytochemical screening of P. macrophylla leaf extract shows the presence of flavonoids and anthraquinones. The nanostructured dye shows conversion of solar energy into electricity using low cost natural dyes as wide band-gap semiconductor sensitizers in DSSCs. This will provide economically viable substitute to silicon p-n junction photovoltaic (PV).

/pdf/characterization-of-dye-sensitized-cells-using-natural-dye-5dssk6s6ho.pdf

Characterization of Dye Sensitized Cells Using Natural Dye from Oil Bean Leaf (Pentaclethra macrophylla): The Effect of Dye pH on the Photoelectric Parameters

A.cepa peels are obtained from mature onion bulbs. Because of the continuous need for energy, alternative avenues for producing energy are gaining importance. The motivation for this work is based on an urgent need to source energy from readily available waste materials like domestic onion peels. Dye sensitized solar cells (DSSCs) fabricated via doctor blade method and high temperature sintering from waste (onion peels) are investigated for their ability to convert solar to electrical energy. The charge carriers were revealed under phytochemical screening. Functional groups of compounds present in A.cepa peel were analyzed with Fourier transform in infrared (FTIR). The influence of different electrolyte sensitizer is observed on the DSSCs under standard air mass conditions of 1.5 AM. The microstructure properties of these A.cepa DSSCs were explored using scanning electron microscope with energy dispersive spectroscopy (SEM/EDS), x-ray diffraction and Fluorecence spectroscopy (XRF). The interfacial boundary between A.cepa dye, TiO2 framework of TiO2 and indium doped tin oxide (ITO) reveals several prominent anatase and rutile peaks. Photoelectric results, revealed dye-sensitized solar cells with a maximum power output of 126 W and incident photon to conversion energy (IPCE) of 0.13%.This work has established that A.cepa peels can be used as a source of micro-energy generation

T.J Abodunrin

Papers

Biodiesel production from palm olein: A sustainable bioresource for Nigeria.

The Effect of Electrolyte on Dye Sensitized Solar Cells Using Natural Dye from Mango (M. indica L.) Leaf as Sensitizer

Radiation dose assessment of soil from Ijero Ekiti, Nigeria

Characterization of Dye Sensitized Cells Using Natural Dye from Oil Bean Leaf (Pentaclethra macrophylla): The Effect of Dye pH on the Photoelectric Parameters

Microstructure characterization of onion (A.cepa) peels and thin films for dye sensitized solar cells