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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>
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.
Irshad Ali,Zahid Manzoor,구정은,문승리,변상희,유은숙,강희경,현진원,이남호,고영상 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.2
Ishige sinicola (I. sinicola) is an edible brown alga native to South Korea. In the present study, we screened the anti-inflammatory activity of monoolein isolated from I. sinicola. Monoolein pretreatment in lipopolysaccharide (LPS)-stimulated primary murine bone marrow-derived dendritic cells (BMDCs) showed strong dose-dependent inhibition of interleukin (IL)-12 p40, IL-6, and TNF-α cytokine production with IC50 values of 1.69±0.02, 6.87±0.37, and 5.19±0.56 μM, respectively. Pretreatment of monoolein attenuated the activation of MAPK and NF-κB pathways in the LPSstimulated BMDCs by inhibiting the phosphorylation of p38, ERK1/2, JNK1/2, and IκBα. Furthermore, monoolein inhibited the production of NO and iNOS in RAW264.7 cells. Overall, our findings indicate that monoolein has a significant anti-inflammatory activity, and further studies regarding the potential of monoolein for medicinal use is warranted.
Irshad Ullah,M. N. R. Baharom,H. Ahmad,B. Das,H. M. Luqman,Jawad Ali,Zainab Zainal 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1
During the lightning activities every air terminal has the equal chances to be hit by the lightning fashes and it produce electric feld in the surrounding. Therefore, with the passage of time when the lightning air terminals become aged due to acidic rain and chemical contamination, lightning air terminal (LAT) bypasses on side edges takes place which has not been given much attention by the researchers. A modifed lightning protection system (LPS) was proposed in this paper using experimental and electromagnetic feld approach. One of the LAT on diferent geometrical structure was selected as sacrifcial point in order to reduce the chances of LAT bypasses. The modifed protection system can be referred by diferent standard to make sure buildings protection. All the experimental work was done using high voltage impulse and ANSYS/MAXWELL was used as a simulation tool. The modifed protection technique will help diferent standards to provide comprehensive protective measures against lightning.
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.
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.