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모하메드,최영선,최지훈 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
This work describes the effect of Ca-doping in CuS counter electrodes to improve the photovoltaic performance of quantum dot-sensitized solar cells. The Ca-doped CuS thin films were synthesized by Chemical bath deposition (CBD) method and the solar cell is fabricated with TiO2/CdS/CdSe/ZnS photoanodes in the presence of polysulfide electrolyte. The surface morphology and electrical properties of the prepared samples were determined using scanning electron microscope, EDAX and electrochemical impedance spectroscopy. The J-V characteristics of thin film samples shows a significant improvement in the photovoltaic parameters. The electrocatalytic activity of Ca-doped CuS counter electrodes were evaluated using cyclic voltammetry. The CV results indicate that the Ca-doped CuS CEs can effectively catalyze the reduction of polysulfide electrolyte compared to QDSSCs incorporating bare CuS CEs.
모하메드마흐무드사드모하메드 ( Mahmoud Saad Mohamed Mohamed ),홍성구 ( Seonggu Hong ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
Biogas is one of important renewable energy forms and its slurry or digestate have high concentration in nutrients and can be used as a good fertilizer for enhancing crop productivity and soil properties. The problem of biogas slurry is its high moisture content ≥ 90 % so it requires long time and high energy in drying or transportation processes. The transportation of raw slurry to farms located far-away is of high cost and could raise the problems of land application, secondary pollution, high nuisance and offensive odor and insufficient consumption. Thus, it is very necessary to separate the water from biogas slurry. The reduction of digestate volume can be achieved by separation of water from the slurry and water obtained from the separation can be used in irrigation or recycling into the digesters to meet moisture requirement. The later is more important in arid region and countries. There are many methods in separating water to concentrate the slurry. This study focused on the chemical thickening by coagulation and flocculation using chemical coagulants. The objectives of this study were solid-liquid separation by coagulation /flocculation process and also determining the best chemical coagulant, optimum coagulant dosage and sedimentation time for the thickening of biogas slurry. The slurry was obtained from a biogas plant fed with swine wastewater. The jar tests were conducted for 500 mL of slurry. Chemicals used for thickening include Calcium Sulfate, 2-hydrate (CaSO<sub>4</sub>·2H<sub>2</sub>O), Ammonium Chloride (NH<sub>4</sub>Cl), Manganese(II) Sulfate pentahydrate (MnSO<sub>4</sub>·H<sub>2</sub>O), Aluminium Sulfate, 14∼18 Water (Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>·14∼ 18H2O), Magnesium Sulfate Anhydrous (MgSO<sub>4</sub>), Aluminium Potassium Sulfate, 12 Water (AlK (SO<sub>4</sub>)<sub>2</sub>·12H<sub>2</sub>O), Iron(III) Chloride hexahydrate, (FeCl<sub>3</sub> 6H<sub>2</sub>O), Iron(III) Sulfate n-hydrate, (Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>. The results showed that the Iron(III) Chloride hexahydrate, (FeCl<sub>3</sub> 6H<sub>2</sub>O) with dosage of 7g/l was the optimum coagulant for the best results of sedimentation and separations.
Highly Electrocatalytic Ca-doped CuS Counter Electrodes for Quantum Dot Sensitized Solar Cells
모하메드,최영선 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Here we report fabrication of highly electrocatalytic calcium doped CuS counter electrodes (CEs) for quantum dot sensitized solar cells (QDSSCs) using chemical bath deposition (CBD) method. The structural, optical, and electrochemical properties of the prepared CEs were explored with the help of different kind of characterization techniques. A suitable amount of Ca doping in CuS thin films enhance the photovoltaic properties. This in turn improve the photovoltage and power conversion efficiency of the solar cell devices. The electrochemical measurements indicate that the electrocatalytic activity of Ca-doped CuS CEs dependent on dopant concentration.
모하메드,최영선 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
The present work reports high power conversion efficiency quantum dot sensitized solar cells (QDSSCs) based on Ca-doped CuS counter electrodes (CEs) with TiO<sub>2</sub>/CdS/CdSe/ZnS photoanodes and a polysulfide electrolyte. Ca-doped CuS thin film was prepared on fluorinedoped tin oxide (FTO) glass surfaces via widely adopted chemical bath deposition (CBD) method. The surface studies of Ca-doped CuS CEs shows that the particles are uniformly distributed with high crystal linity structure. EDAX analysis results indicates that Cu, S, and Ca ions successfully deposited on the surface of FTO plate. All the experimental results indicate that 20% Ca-doped CuS CE based QDSSCs exhibit high power conversion efficiency (η) of 4.92%.
Aspergillus fumigatus에서 Methyltransferase 유전자 AfuvipB와 AfuvipC의 분리 및 분석
모하메드,한갑훈,Elgabbar, Mohammed A. Abdo,Han, Kap-Hoon 한국균학회 2015 韓國菌學會誌 Vol.43 No.1
사상성 진균에서 veA 유전자와 연계되어 있는 velvet 복합체는 진균의 분화와 이차 대사산물의 조절에 매우 중요한 기능을 한다. 모델 사상균인 Aspergillus nidulans의 경우 methyltransferase인 VipB와 VipC를 포함한 여러 단백질들이 VeA 단백질과 상호작용하는 것으로 알려져 있다. 본 연구에서는 인간 기회감염 진균인 Aspergillus fumigatus에서 vipB와 vipC 유전자의 상동유전자를 분리하여 각각 AfuvipB와 AfuvipC로 명명하였다. AfuvipB 유전자는 AspGD 데이터베이스에 Afu3g14920으로 등록되어 있으며 1,510 bp 길이에 10개의 인트론을 가지고 있고, 유전자 산물은 336 아미노산 잔기로 구성된 단백질로 methyltransferase 도메인을 가지고 있었다. AfuvipC는 Afu8g01930으로 AfuvipB와 유사하게 10개의 인트론을 가지고 있으며 339개의 아미노산으로 구성된 methyltransferase를 암호화하고 있었다. A. fumigatus에서 각각의 유전자에 대한 기능을 알아보고자 유전자제거 돌연변이 균주들을 제조하고 그들의 표현형을 관찰하였다. AfuvipB 유전자 제거 돌연변이는 점 접종을 하였을 경우 대조군에 비하여 표현형의 차이를 보이지 않았다. 그러나 단일 포자에서 성장한 콜로니를 비교해 보았을 때 대조군에 비하여 그 크기가 작고 분화 속도도 약간 더딘 것을 관찰할 수 있었다. 반면에 AfuvipC 유전자 제거 돌연변이는 대조군과 비교하였을 때 표현형의 차이를 보이지 않았다. 이러한 결과는 두 개의 methyltransferase가 상호 중복적인 역할을 수행하거나 정상적인 실험실 배양조건에서는 중요한 기능을 수행하지 않을 수 있음을 시사한다. In filamentous fungi, velvet complex associated with the veA gene plays pivotal roles in development and secondary metabolism. In a model fungus Aspergillus nidulans, many proteins that can interact with VeA, including two methyltransferases VipB and VipC, have been isolated and characterized. In this study, we isolated homologs of the vipB and vipC genes in the human opportunistic pathogenic fungus Aspergillus fumigatus and named AfuvipB and AfuvipC. The AfuvipB gene, annotated as Afu3g14920 in the Aspergillus Genome Database (AspGD) database, consists of 1,510 bp interrupted with 10 introns yielding 336 amino acid-long putative methyltransferase protein. Similarly, AfuvipC, which is Afu8g01930, has 10 introns and encodes a polypeptide with 339 amino acids having a methyltransferase domain in the middle of the protein. To characterize the function of the genes in A. fumigatus, knock-out mutants were generated and the phenotypes were observed. Deletion of AfuvipB gene caused no obvious phenotypic change on point inoculation but showed smaller colony than wild-type when the mutant was subjected to culture on single spore-driven culture condition. However, AfuvipC deletion mutant demonstrated no phenotypic difference from wild type both in point inoculation and streaking cultures. These results indicate that the two methyltransfereases might have a redundant role and could be dispensable in normal culture conditions.
모하메드,최영선 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
This work describes the effect of H3PO4 treatment on the surface of CuS counter electrodes to improve the photovoltaic performance and stability of quantum dot sensitized solar cells (QDSSCs). The various concentrations of H3PO4 treated CuS thin films were successfully grown on a conducting FTO substrate by chemical bath deposition (CBD) method. Solar cell devices were designed using CdS/CdSe photoelectrodes and H3PO4 treated CuS counter electrodes with a polysulfide electrolyte. Under the illumination of one sun (AM 1.5 G, 100 mW cm-2), 4 ml H3PO4 treated CuS counter electrode based QDSSC exhibit excellent short-circuit current density, open circuit voltage, fill factor and power conversion efficiency . The improved photovoltaic parameters of QDSSCs is due to the high electrocatalytic activity of H3PO4 treated CuS counter electrodes.