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RISS 인기검색어
- 검색키워드
- 저자 : Ghulam Yasin (검색결과 4 건)
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Qamar Yasin,Qizhen Du,Ghulam M. Sohail,Atif Ismail 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.5
The economic success of shale gas plays depends expansively on the brittle-ductile behavior of shale rock for effective hydraulic fracturing. Successful hydraulic fracturing requires targeting the most brittle rocks. Therefore it is worthwhile to classify the shale regarding brittle and ductile zones. To study the impact of brittleness indices in the brittle-ductile transitional zone, we have estimated the mineralogy-based brittleness index, TOC (total organic carbon), pore pressure and geomechanical properties from well logs and core description laboratory measurements. The petrophysical model of Sembar shale from Indus basin Pakistan was compared to brittleness index, organic contents, and pore pressure to differentiate the transitional zones in shale gas reservoirs. The result shows that constant change in rock minerals distribution and brittleness index follow the trend in TOC content, in brittle- ductile and transitional zone. Also, the data was plotted in λρ-μρ lithology templates and plots of Young’s modulus and Poisson’s ratio, shale with high quartz and clay contents trap in less ductile to less brittle zone while shale with abundant quartz and low clay contents give rise in the brittle zone. The observations of this study support the previous research idea by suggesting the zones of brittle and transition controlled by TOC to design the hydraulic fracture more efficient.
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Sadeeq Ullah,Benoît D.L. Campéon,Shumaila Ibraheem,Ghulam Yasin,Rajesh Pathak,Yuta Nishina,Tuan Anh Nguyen,Yassine Slimani,Qipeng Yuan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
Two-dimensional (2D) materials are generally expected to have superior lithium-ion (LIBs) performancescompare with their bulk counterpart as they display superior specific surface area. In this context, thedevelopment of 2D maghemite would be of great interest owing to its high theoretical specific capacity,natural abundance, and relatively low cost and toxicity; however, maghemite do not have a layered crystallinestructure. Herein, to overcome this hindrance, c-Fe2O3 has been enclosed within a 2D carbonmatrix via a simple and facile synthesis strategy based on the complexation of ethylene glycol with aqueousiron species by hydrolysis and condensation reactions followed by its carbonization. As obtained 2Dcarbon c-Fe2O3 nanosheet composite (CEG-Fe) is composed of 41.3 wt.% carbon and 10.2 wt.% Fe. Whenused as anode materials in LIBs, CEG-Fe demonstrated the enhanced initial discharge capacity of1589 mAh g 1 at 100 mA g 1, and outstanding ultralong cycling performance with the significant stablecapacity of 700 mAh g 1 and 230 mAh g 1 at the higher current rate of 0.5 A g 1 and 10 A g 1 for morethan 300 and 6000 cycles, respectively. These results enable a promising avenue to design the large-scaleproduction of 2D CEG-Fe sheets-based nanostructured anode materials for next-generation LIBs for largescaleenergy storage applications.
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Comparison and evaluation of the performance of graphene-based biosensors
Abdelbasset Walid Kamal,Jasim Saade Abdalkareem,Bokov Dmitry Olegovich,Oleneva Maria Sergeevna,Islamov Anvar,Hammid Ali Thaeer,Mustafa Yasser Fakri,Yasin Ghulam,Alguno Arnold C.,Kianfar Ehsan 한국탄소학회 2022 Carbon Letters Vol.32 No.4
Biosensors are a group of measurement systems and their design is based on the selective identification of analyses based on biological components and physical and chemical detectors. Biosensors consist of three components: biological element, detector, and converter. The design of biosensors in various fields of biological sciences, medicine has expanded significantly. Biosensor technology actually represents a combination of biochemistry, molecular biology, chemistry, physics, electronics, and telecommunications. A biosensor actually consists of a small sensor and biological material fixed on it. Because biosensors are a powerful tool for identifying biological molecules, today they are used in various medical sciences, chemical industry, food industry, environmental monitoring, pharmaceutical production, health, etc. In fact, these sensors are a powerful tool to identify biological molecules. In fact, biosensors are analytical tools that can use biological intelligence to detect and react with a compound or compounds, and thus create a chemical, optical, or electrical message. The basis of a biosensor is to convert a biological response into a message. In this category, the use of telecommunication engineering technology and electromagnetic waves and frequency and radio spectrum is growing more and more to detect, measure, and determine the desired parameters in microbiology and laboratory sciences. The use of radio, optical, electromagnetic, ultrasonic, and infrared wave detection technology is part of the applications of telecommunication science in this field. Even image and audio processing systems have been instrumental in the discussion of biosensors in microbiology. The science of using fiber optics and waveguides, micro-strip antennas, and microelectromechanical technology is also very efficient in the construction and design of these biosensors.
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Anuj Kumar,Dipak Kumar Das,Raj Kishore Sharma,Manickam Selvaraj,Mohammed A. Assiri,Saira Ajmal,Guoxin Zhang,Ram K. Gupta,Ghulam Yasin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Although the N4-macrocyclic ligands have been used to develop single-atom catalysts (SACs), their utilizationfor the construction of dual-atom catalysts (DACs) for electrocatalytic oxygen reduction reaction(ORR) is poorly investigated. Herein, a binuclear phthalocyanine (bN-Pc) was explored as a theoreticalmodel for the construction of FeFe-bN-Pc, CoCo-bN-Pc, and FeCo-bN-Pc dual-atom-site configurationsand their ORR activity along with mechanisms were investigated systematically in alkaline media, usingdensity functional theory (DFT) calculations. The results indicated that the dual-atom-bN-Pc models, havingclose proximity between adjacent metals, invited individual O-atom of O2 for coordination on bothsites, forming a cis-bridged-O2 adduct. The Gibbs free energy studies showed that the decompositionof O2 on dual-atom sites was the rate-determining step, and the Fe-Co-bN-Pc had a lower energy barrier(0.591 eV) for this step as compared to Fe-Fe-bN-Pc (0.641 eV) and Co-Co-bN-Pc (0.692 eV), which justifiesits stronger ORR performance. The synergistic effect of Fe-Co collaboration, the close proximity ofFe-Co, and the significant e- donation from the 3d-orbital of active sites into the *orbital of O2 can beattributed to this decrease in limiting the potential for the rate-determining step on Fe-Co-bN-Pc. Forfuture ORR electrocatalysts, this work offers a scientific and engineering perspective on the constructionof dual-atom active sites employing molecular moieties.
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