In Vitro Studies on Microtuber Induction in Potato

Muhammad J. Jaskani,T. Rafique,H. Raza1,S. W. Kwon(권성환) 한국원예학회 2003 한국원예학회 학술발표요지 Vol.2003 No.10

A ZnO nanowire-based photo-inverter with pulse-induced fast recovery.

Raza, Syed Raza Ali,Lee, Young Tack,Hosseini Shokouh, Seyed Hossein,Ha, Ryong,Choi, Heon-Jin,Im, Seongil RSC Pub 2013 Nanoscale Vol.5 No.22

<P>We demonstrate a fast response photo-inverter comprised of one transparent gated ZnO nanowire field-effect transistor (FET) and one opaque FET respectively as the driver and load. Under ultraviolet (UV) light the transfer curve of the transparent gate FET shifts to the negative side and so does the voltage transfer curve (VTC) of the inverter. After termination of UV exposure the recovery of photo-induced current takes a long time in general. This persistent photoconductivity (PPC) is due to hole trapping on the surface of ZnO NWs. Here, we used a positive voltage short pulse after UV exposure, for the first time resolving the PPC issue in nanowire-based photo-detectors by accumulating electrons at the ZnO/dielectric interface. We found that a pulse duration as small as 200 ns was sufficient to reach a full recovery to the dark state from the UV induced state, realizing a fast UV detector with a voltage output.</P>

The Determinants of Pakistani Tourists’ Visit Intention to Korea in SNS Context- The Effect of Usefulness, Interestingness and Involvement

Muhammad RAZA(Muhammad RAZA ),Jin-Kwon KIM(Jin-Kwon KIM),Tony-Donghui AHN(Tony-Donghui AHN) 국제융합경영학회 2023 융합경영연구 Vol.11 No.2

Purpose: The purpose of this study is to analyze the relationship between characteristics of social media sites (SNS) and the intention of Pakistani tourists to visit South Korea while determining the role of usefulness, interestingness, and involvement of tourists. Research design, data and methodology: A research model was developed through the previous research, and the questioner-based survey was conducted on Pakistani tourists visiting Korea. The survey data was collected by following multiple hypotheses: the relationship between SNS tourism information and perception of SNS, the relationship between SNS perception and intention to visit, and adjustment of involvement in the relation between tourism information characteristics, and SNS perception. We used SPSS and AMOS24.0 statistical tools to analyze the hypothesis testing data. Results: Based on the data analysis, the study found that the characteristics of SNS have a positive effect on intention to visit via users’ perception like usefulness and interestingness. The involvement has a moderating effect between SNS characteristics and users’ perception. In the group with high involvement, the degree of influence of the quality factor of SNS on user perception was greater than in the group with low involvement. Conclusions: This study demonstrated that traveler's involvement has a moderating effect on the relationship between SNS characteristics and visit intention for Pakistani travelers visiting Korea. It shows that practitioners or researchers should establish and operate SNS strategies in consideration of user involvement.

Electrical joule heating for the isolation of ZnO nanowire channel and subsequent high-performance 1D circuit integration

Syed Raza Ali Raza,임준영,Zamir-ul-Hassan,임성길,이영탁 한국물리학회 2020 Current Applied Physics Vol.20 No.12

In this work, electrical Joule heating (J-H) was employed for the first time to electrically isolate ZnO nanowire FETs array for one dimensional (1D) logic applications without any physical and electrical damages. The electrical properties of the isolated nanowire FETs were found to be superior to non-isolated FETs came from the neighboring gate effect. Finally, we investigated ZnO nanowire-based NOT, NAND, and NOR logic gates with the J-H nanowire isolation technique. The isolated logic gates clearly show much lower output voltage off level than the non-isolated circuits thus resulting in more accurate and reliable 1D electronic applications.

Synthesis and Biological Evaluation of 3‐thiazolocoumarinyl Schiff‐base Derivatives as Cholinesterase Inhibitors

Raza, Rabia,Saeed, Aamer,Arif, Mubeen,Mahmood, Shamsul,Muddassar, Muhammad,Raza, Ahsan,Iqbal, Jamshed Blackwell Publishing Ltd 2012 Chemical biology & drug design Vol.80 No.4

<P>On the basis of the observed biological activity of the coumarins, a new set of 3‐thiazolocoumarinyl Schiff‐base derivatives with chlorine, hydroxy and methoxy functional group substitutions were designed and synthesized. These compounds were tested against acetylcholinesterase from <I>Electrophorus electricus</I> and butyrylcholinesterase from horse serum and their structure–activity relationship was established. Studies revealed them as the potential inhibitors of cholinesterase (acetylcholinesterase and butyrylcholinesterase). The <B>3f</B> was found to be most potent against acetylcholinesterase with <I>K</I><SUB>i</SUB> value of 1.05 ± 0.3 μ<SMALL>m</SMALL> and <B>3l</B> showed excellent inhibitory action against butyrylcholinesterase with <I>K</I><SUB>i</SUB> value of 0.041 ± 0.002 μ<SMALL>m</SMALL>. The synthesized compounds were also docked into the active sites of the homology models of acetylcholinesterase and butyrylcholinesterase to predict the binding modes of these compounds. It was predicted that most of the compounds have similar binding modes with reasonable binding affinities. Our docking studies have also shown that these synthesized compounds have better interaction patterns with butyrylcholinesterase over acetylcholinesterase. The main objective of the study was to develop new potent and selective compounds, which might be further optimized to prevent the progression of the Alzheimer’s disease and could provide symptomatic treatment.</P>

Recent advancements in supercapacitor technology

Raza, Waseem,Ali, Faizan,Raza, Nadeem,Luo, Yiwei,Kim, Ki-Hyun,Yang, Jianhua,Kumar, Sandeep,Mehmood, Andleeb,Kwon, Eilhann E. Elsevier 2018 Nano energy Vol.52 No.-

<P><B>Abstract</B></P> <P>Supercapacitors (SCs) are attracting considerable research interest as high-performance energy storage devices that can contribute to the rapid growth of low-power electronics (e.g., wearable, portable electronic devices) and high-power military applications (e.g., guided missile techniques and highly sensitive naval warheads). The performance of SCs can be assessed in terms of the electrochemical properties determined through a combination between the electrode and the electrolyte materials. Likewise, the charge storage capacities of SCs can be affected significantly by selection of such materials (e.g., via surface redox mechanisms). Enormous efforts have thus been put to make them more competitive with existing options for energy storage such as rechargeable batteries. This article reviews recent advances in SC technology with respect to charge storage mechanisms, electrode materials, electrolytes (e.g., particularly paper/fiber-like 3D porous structures), and their practical applications. The challenges and opportunities associated with the commercialization of SCs are also discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> There has been great demand for a reliable technical platform for electrochemical storage. </LI> <LI> SCs are highly attractive option due to their fast storage capability and enhanced cyclic stability. </LI> <LI> This review covers the charge storage mechanisms of SCs along with comparison of selected SCs. </LI> <LI> We also discuss the technical challenges for developing SCs with high enough energy density. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Recent developments in analytical quantitation approaches for parabens in human-associated samples

Raza, Nadeem,Kim, Ki-Hyun,Abdullah, Muhammad,Raza, Waseem,Brown, Richard J.C. Elsevier 2018 Trends in analytical chemistry Vol.98 No.-

<P>Parabens are an important class of antimicrobial compounds used as preservatives. Although they are considered to be safe when used within specified concentration limits, concerns about their potential toxicity have been raised due to their presence in cancerous breast tissues and their association with estrogenic activity, various kinds of allergies, and the malfunctioning of reproductive organs. The small quantities of parabens in human samples and complex nature of biological matrices make it difficult to determine free and/or conjugated forms of parabens and their metabolites. Consequently, it is desirable to develop sophisticated approaches for their sample pretreatments and subsequent determination. This review presents recent developments in the extraction, pre-concentration, and instrumental detection methods needed for the accurate quantification of parabens in human samples. This review is thus expected to help readers assess the potential impacts of parabens on human health through proper description of their exposure routes to human. (C) 2017 Elsevier B.V. All rights reserved.</P>

Multistep sequestration and storage of CO₂ to form valuable products using forsterite

Raza, Waseem,Raza, Nadeem,Agbe, Henry,Kumar, R.V.,Kim, Ki-Hyun,Yang, Jianhua Elsevier 2018 ENERGY Vol.155 No.-

<P><B>Abstract</B></P> <P>The potential use of mineralogical carbonation is greatly acknowledged not only in reducing CO<SUB>2</SUB> emissions through carbon capture and storage (CCS) but also in producing industrially viable products. The direct carbonation of stable silicate minerals by supercritical CO<SUB>2</SUB> is unrealistic due to the low conversion efficiencies. The natural abundance of silicate minerals (e.g., olivine) is theoretically sufficient to fix the entire quantity of man-made CO<SUB>2</SUB> emissions, while carbonation of sorbents obtained from the dissolution of silicate rocks could proceed in a multistep (or continuous) process. In this work, the optimum experimental conditions for a multistep procedure of sequestration of minerals and conversion of CO<SUB>2</SUB> into valuable products were investigated using synthetic forsterite. In this research, magnesium sulfate obtained from the dissolution of forsterite in aqueous H<SUB>2</SUB>SO<SUB>4</SUB> was successfully carbonated to produce valuable byproducts (e.g., silica and hydrates of magnesite) with an economical carbonation as a means of CO<SUB>2</SUB> mitigation. Hydromagnesite, while being commercially applied in various fields (e.g., fire retardation and catalysis), can be transformed to magnesite which is stable for millions of years.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The carbonation of synthetic forsterite can be achieved via multistep reaction pathways. </LI> <LI> Through such conversion, the complete set of valuable products can be produced. </LI> <LI> This approach can effectively mitigate CO<SUB>2</SUB> through the formation of valuable products. </LI> <LI> In this work, optimum reaction conditions for such conversion has been sought. </LI> </UL> </P>

Removal of phenolic compounds from industrial waste water based on membrane-based technologies

Waseem Raza,이제찬,Nadeem Raza,Yiwei Luo,김기현,Jianhua Yang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-

Phenol and its derivatives from various man-made activities pose threats to public health and aquaticecosystems. A number of technologies (e.g., adsorption, oxidation, and biological methods) have beenproposed and tested to remove phenolic compounds from waste water. Among these technologies,membrane separation is considered one of the most efficient tools for abating phenolic compounds fromwaste water because of low capital cost, easy scalability, and ecofriendly production with the lowestemission of noxious compounds. In this review, we aim to address the potent role of membranetechnology by evaluating its performance in separating various phenolic compounds from industrialeffluents.

Performance Comparison of Dual Airgap and Single Airgap Spoke-Type Permanent-Magnet Vernier Machines

Raza, Mudassir,Zhao, Wenliang,Lipo, Thomas A.,Kwon, Byung-il IEEE 2017 IEEE transactions on magnetics Vol.53 No.6

<P>This paper compares the performance of three different topologies of spoke-type permanent-magnet vernier machines (PMVM): 1) dual airgap dual stator winding (DSW); 2) dual airgap single stator winding (SSW); and 3) single airgap (SA). These topologies were compared in terms of torque/machine volume, cogging torque, and torque ripples. The 2-D finite element method was utilized to compare the performance of the three models. The dual airgap PMVM with a SSW showed similar performance with the same machine outer diameter and similar power in terms of torque/machine volume and torque ripples compared with the DSW model. The performance of the SSW model was better than that of the SA model for the same outer diameter and rotor. Furthermore, stator slot optimization was performed to improve torque/machine volume and reduce torque ripples in the SSW model.</P>