http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Irshad Ahmad,Shazia Shukrullah,Muhammad Yasin Naz,Sami Ullah,Mohammed Ali Assiri 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
Photocatalysis has emerged as a promising technology for solving global environmental and energy challenges. The selectivity of low-cost, non-toxic and thermochemically stable materials for photocatalyticapplications is crucial to meet the industrial standards. Despite of owing unique layered structure, distinctelectronic band structure and tunable optical properties, the bismuth oxyhalides BiOX (X = Cl, Brand I) photocatalytic materials suffer from rapid recombination of charge carriers and limited lightabsorption issues. These limitations restrict the photocatalytic efficiency and industrial applications ofBiOX materials. The focus of this critical review is to discuss recent developments in the design and modificationof existing and new BiOX materials for getting optimum photocatalytic response from thesematerials. The key elements of the review are BiOX synthesis methods, BiOX driven water splitting, singleand double stage hydrogen evolution systems, degradation of organic pollutants and trends of boostingthe photocatalytic efficiency of the BiOX materials. Finally, this insight discusses the existing issues andfuture perspectives of BiOX photocatalysts.
Irshad, Muhammad,Hong, Min Eui,Myint, Aye Aye,Kim, Jaehoon,Sim, Sang Jun De Gruyter 2019 International journal of food engineering Vol.15 No.10
<P><B>Abstract</B></P><P><I>Haematococcus pluvialis</I>(<I>H. pluvialis</I>) can naturally accumulate high amounts of astaxanthin - a powerful antioxidant. However, complete recovery of astaxanthin from the cysts of<I>H. pluvialis</I>is challenging because of the presence of a robust acetolysis resistant cell wall. Herein, a simple and effective planetary ball-milling pretreatment was developed to rupture the cells to attain an almost complete recovery of astaxanthin from<I>H. pluvialis</I>, using a supercritical CO<SUB>2</SUB>and conventional organic solvent-based extraction. An optimized pretreatment using planetary ball mill under very mild conditions (150 rpm, 60 min) allowed the recovery of 31.4 mg/g dry weight of astaxanthin from<I>H. pluvialis</I>, while slightly harsh milling (500 rpm) was found to be detrimental toward astaxanthin. The extracts in acetone exhibited higher antioxidant activity in 1-diphenyl-2-picrylhydrazyl assay than those in dichloromethane. These mild conditions were safe and highly effective for the complete extraction of astaxanthin along with the others extractables. This study opens a new avenue for the efficient recovery of valuable thermolabile ketocarotenoid species from microalgae, which can be applied to the development of economically viable biorefineries.</P>
Low temperature synthesis of Nafion/Ceria nanocomposite through self-assembly process
( Irshad Mobina ),김주영 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A relatively low temperature synthesis of nano-structured Nafion/CeO<sub>2</sub> composites was carried out without any heat treatment and surfactant. Through self-assembled structure of Nafion in the solution, colloidally stable solutions, where ceria nanoparticles were dispersed in the presence of Nafion, could be prepared. Obtained ceria/Nafion solutions were casted to prepare ceria/Nafion nanocomposite films. Formation of ceria nanoparticles in the solutions and the nanocomposite films were characterized by SEM, TGA, and EDS analysis. Also, type of Nafion, amount of ceria precursors, and weight ratio of ceria/Nafion was changed to study their effect on the dispersibility and size of ceria nanoparticles in the solutions and the nanocomposite films.
Irshad Kammakakam,김태현,Anil H. N. Rao,윤희욱,남상용,박호범 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
A novel imidazolium-based ionene was mixed with a di(ethylene glycol) diacrylate that was subsequentlyphotocrosslinked to form a blend membrane useful for CO2/N2 gas separation. The crosslinked poly(ethylene oxide) (PEO)offered a mechanically stable matrix with a high CO2 affinity. The ionene loading affected both the structure andCO2 separation performance of the blend membranes as demonstrated by varying the ionene content in three levels,1:1, 2:1, and 3:1 (ionene:crosslinker) by weight. The CO2 solubility of the membrane dramatically increased withthe ionene loading level, and a high CO2/N2 permselectivity of 33.5 was obtained for the [3II-cPEO][TFSI]. Theimidazolium-based ionene blend membranes prepared with crosslinked PEO (II-cPEO) also displayed good thermaland mechanical stability.
Synthesis and characterization of hexagonal ferrite Co2Sr2Fe12O22 with doped polypyrrole composites
Irshad Ali,Abdul Shakoor,M.U. Islam,Muhammad Saeed,Muhammad Naeem Ashiq,M.S. Awan 한국물리학회 2013 Current Applied Physics Vol.13 No.6
Y-type hexagonal ferrite Co2Sr2Fe12O22 was prepared by microemulsion route. A conducting polymer,polypyrrole was chemically synthesized and doped with dodecylbenzenesulphonic acid (PPy$DBSA). FTIR and magnetic properties of Co2Sr2Fe12O22 were investigated and compared with composite made by mixing the Co2Sr2Fe12O22 with this conducting polymer PPyeDBSA by 1:1 molar ratio. Phase analysis was performed by using X-ray diffraction (XRD). The microstructure was examined by scanning electron microscopy (SEM) showing heterogonous distribution of grains. The field dependent magnetic properties of the prepared samples were investigated at room temperature by using vibrating sample magnetometer (VSM). It has been observed that mixing of polymer in ferrite plays a crucial role in enhancing the coercivity, while saturation magnetization (Ms) and remanance were observed to decrease. Due to fine grain size, the density of grain boundaries increases where the domain wall pinning can take place,hence the coercivity of the composite samples increases. Appreciable improved value of coercivity guaranteed the use of these synthesized materials in the recording media, which is ¼1896(Oe) in the present samples. The suitable signal-to-noise ratio in the high density recording media can be achieved due to small particles size of this synthesized composite, which is expected in the present ferriteepolymer composite sample.
Irshad, Azeem,Ahmad, Hafiz Farooq,Alzahrani, Bander A.,Sher, Muhammad,Chaudhry, Shehzad Ashraf Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Multi-server authentication enables the subscribers to enjoy an assortment of services from various service providers based on a single registration from any registration centre. Previously, a subscriber had to register from each service provider individually to avail respective services relying on single server authentication. In the past, a number of multi-server authentication techniques can be witnessed that employed lightweight and even computationally intensive cryptographic operations. In line with this, Zhu has presented a chaotic map based multi-server authentication scheme recently, which is not only vulnerable to denial-of-service attack, stolen-verifier attack, but also lacks anonymity. This research aims at improving the Zhu's protocol in terms of cost and efficiency. Moreover, the comparative study is presented for the performance of improved model against the existing scheme, and the security of proposed model is formally proved using BAN Logic.
Fault detection of composite beam by using the modal parameters and RBFNN technique
Irshad Ahmad Khan,Dayal Ramakrushna Parhi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
The detection of transverse cracks in terms of their location and intensity by using the radial basis function neural network (RBFNN)technique is analyzed in the current research and validated with experimental investigation. The glass fiber-reinforced epoxy composite isused in this research because of its valuable features, such as high stiffness and strength-to-weight ratios, good fatigue and wear resistance,and damage tolerance capability compared with isotropic material. The theoretical and numerical investigations are performed toobtain a relationship between the change in natural frequencies and mode shapes for the cracked and noncracked composite beam. Numericalanalysis is performed by using the finite element software ANSYS on cracked and noncracked composite beams to measure themodal parameters, such as natural frequencies and mode shapes. These parameters are used to design an artificial intelligent controllerbased on the RBFNN-type neural network for predicting crack severity and its intensity. The relative natural frequencies and modeshapes (First, second, and third modes) of vibration are used as input data to the RBFNN controller, and the relative crack locations andcrack depths are the output of RBFNN. Results from theoretical and numerical analysis are compared with the experimental results, and agood agreement is observed between them.