Synthesis and Characterization of Aqueous Curcumin Polyurethane Dispersions Using Isophorone Diisocyanate: Efficiency Evaluation as Textile Finishes

Noureen Arshad,Khalid Mahmood Zia,Muhammad Tahir Hussain,Muhammad Mubeen Arshad,Mohammad Zuber 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7

This research is aimed at synthesizing some novel bio-based ecofriendly finishes for textile applications. A seriesof curcumin based aqueous polyurethane (PU) dispersions (CUR-WDPU-IPDI) was prepared using polyethylene glycol(PEG), isophorone diisocyanate (IPDI) and dimethylolpropanoic acid (DMPA) via conventional pre-polymer process. Thedual functionality is incorporated by hindering the polyurethane pre-polymer with isocyanate (-NCO) groups and curcuminwas utilized to extend the polymeric chain to achieve the CUR-WDPU-IPDI dispersion. Structural characteristics of thesynthesized polymer were investigated by Fourier Transform Infrared (FT-IR) spectrophotometer. The performance of PUdispersions for increasing the color fastness properties (washing, rubbing and perspiration fastness) of plain weave fabrics(poly/cotton, dyed and printed) was studied. Furthermore, the mechanical strength (pilling, tearing and tensile strength) of thesaid fabric (dyed, printed and white) was also evaluated. Results clearly exhibited that the color fastness properties andmechanical strength of the dyed, printed and white fabrics were improved significantly after treating with the PU finishes. These synthesized curcumin-based water dispersible polyurethanes (CUR-WDPU-IPDI) finishing agents are greenerproducts which are particularly derivatized from bio-resources. Owing to their biocompatibility, copious availability, lessnoxious, greener methodology and ecofriendly nature, these can be utilized as attractive ecofriendly alternatives for textileapplications.

Characterization of Poly(methyl methacrylate)-tin (IV) Chloride Blend by TG-DTG-DTA, IR and Pyrolysis-GC-MS Techniques

Arshad, Muhammad,Masud, Khalid,Arif, Muhammad,Rehman, Saeed-Ur,Saeed, Aamer,Zaidi, Jamshed Hussain Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.9

Thermal behavior of poly (methyl methacrylate) was analyzed in the presence of tin (IV) chloride. Five different proportions - polymer to additive - were selected for casting films from common solvent. TG, DTG and DTA were employed to monitor thermal degradation of the systems. IR and py-GC-MS helped identify the decomposition products. The blends start degrading at a temperature lower than that of the neat polymer and higher than that of the pure additive. Complex formation between tin of additive and carbonyl oxygen (pendent groups of MMA units) was noticed in the films soon after the mixing of the components in the blends. The samples were also heated at three different temperatures to determine the composition of residues left after the expulsion of volatiles. The polymer, blends and additive exhibited a one step, two-step and three-step degradation, respectively. $T_0$ is highest for the polymer, lowest for the additive and is either $60^{\circ}C$ or $70^{\circ}C$ for the blends. The amount of residue increases down the series [moving from blend-1 (minimum additive concentration) to blend-5 (maximum additive concentration)]. For blend-1, it is 7% of the original mass whereas it is 16% for blend-5. $T_{max}$ also goes up as the concentration of additive in the blends is elevated. The complexation appears to be the cause of observed stabilization. Some new products of degradation were noted apart from those reported earlier. These included methanol, isobutyric acid, acid chloride, etc. Molecular-level mixing of the constituents and "positioning effect" of the additive may have brought about the formation of new compounds. Routes are proposed for the appearance of these substances. Horizontal burning tests were also conducted on polymer and blends and the results are discussed. Activation energies and reaction orders were calculated. Activation energy is highest for the polymer, i.e., 138.9 Kcal/mol while the range for blends is from 51 to 39 Kcal/mol. Stability zones are highlighted for the blends. The interaction between the blended parts seems to be chemical in nature.

Efficient removal of crystal violet and eosin B from aqueous solution using Syzygium cumini leaves: A comparative study of acidic and basic dyes on a single adsorbent

Arshad Mehmood,Sheher Bano,Aisha Fahim,Riffat Parveen,Shazia Khurshid 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5

The adsorption capabilities of Syzygium cumini leaves were investigated for crystal violet and eosin B using batch adsorption method. Removal conditions were optimized by varying operational parameters like pH, dose of adsorbent, contact time and temperature. Presence of salts had a profound effect on the adsorption and the experimental data for both adsorbates, providing good correlation with the Temkin, Langmuir and Freundlich patterns, but differing from Dubinin-Radushkevich model. Maximum adsorption capacity was found to be 38.75 mg/g for crystal violet and 16.28mg/g for eosin B respectively. Boyd-Adamson-Myers, Morris-Weber and Bangham’s surface mass transport models revealed that film diffusion was the rate controlling process and followed pseudo-second order kinetics. Activation energy was estimated to be 57.265 and 6.721 kJ/mol for crystal violet and eosin B respectively. Adsorption of crystal violet is endothermic and that of Eosin B is exothermic but both were spontaneous at all temperatures. To study the bulk removal of the dyes, column operations were made. The exhausted columns were regenerated by eluting HCl solution and almost 91.94% of CV and 58.08% of EB were recovered from columns, respectively.

Interactive Effect of Nitrogen and Sulphur on Yield and Quality ofGroundnut (Arachis hypogea L.)

Arshad Jamal,Inayat Saleem Fazli,Saif Ahmad,Malik Zainul Abdin 한국작물학회 2006 Korean journal of crop science Vol.51 No.7

Randomized field experiments were conducted to study the interactive effect of sulphur (S) and nitrogen (N) on seed, oil and protein yield of two cultivars of groundnut {Arachis hypogea: cv Amber (V1); cv Kaushal, (V2)}. Two dosage levels of sulphur (0 and 20 kg ha-1) and two dosage levels of N (23.5 and 43.5 kg ha-1) in various combinations were tested as micronutrient treatments, T1, T2, and T3. Results indicated significant enhancement of the yield components namely seed and oil yield as well as seed protein. Maximum response was observed with treatment T3 (having 20 kg S and 43.5 kg N ha-1). Increase in seed and oil yields of 90% and 103 % in V1, and 79 and 90 % in V2, respectively were recorded as compared to the control treatment T1 (having 0 kg S and 23.5 kg N ha-1). Effect of S and N interaction was observed on protein, N and S content in seeds. The results obtained by these experiments clearly suggest that judicious balanced application of N and S could improve the yield.

A Secure Face Cryptogr aphy for Identity Document Based on Distance Measures

Arshad, Nasim,Moon, Kwang-Seok,Kim, Jong-Nam Korea Multimedia Society 2013 멀티미디어학회논문지 Vol.16 No.10

Face verification has been widely studied during the past two decades. One of the challenges is the rising concern about the security and privacy of the template database. In this paper, we propose a secure face verification system which generates a unique secure cryptographic key from a face template. The face images are processed to produce face templates or codes to be utilized for the encryption and decryption tasks. The result identity data is encrypted using Advanced Encryption Standard (AES). Distance metric naming hamming distance and Euclidean distance are used for template matching identification process, where template matching is a process used in pattern recognition. The proposed system is tested on the ORL, YALEs, and PKNU face databases, which contain 360, 135, and 54 training images respectively. We employ Principle Component Analysis (PCA) to determine the most discriminating features among face images. The experimental results showed that the proposed distance measure was one the promising best measures with respect to different characteristics of the biometric systems. Using the proposed method we needed to extract fewer images in order to achieve 100% cumulative recognition than using any other tested distance measure.

Fault Detection in the Semiconductor Etch Process Using the Seasonal Autoregressive Integrated Moving Average Modeling

Arshad, Muhammad Zeeshan,Nawaz, Javeria Muhammad,Hong, Sang Jeen Korea Information Processing Society 2014 Journal of information processing systems Vol.10 No.3

In this paper, we investigated the use of seasonal autoregressive integrated moving average (SARIMA) time series models for fault detection in semiconductor etch equipment data. The derivative dynamic time warping algorithm was employed for the synchronization of data. The models were generated using a set of data from healthy runs, and the established models were compared with the experimental runs to find the faulty runs. It has been shown that the SARIMA modeling for this data can detect faults in the etch tool data from the semiconductor industry with an accuracy of 80% and 90% using the parameter-wise error computation and the step-wise error computation, respectively. We found that SARIMA is useful to detect incipient faults in semiconductor fabrication.

Comparative study of abutment screw loosening with or without adhesive material

Arshad, Mahnaz,Shirani, Gholamreza,Refoua, Sina,Yeganeh, Mohammadreza Rahimi The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. The purpose of this study was to achieve more retention and stability and to delay or prevent screw loosening. MATERIALS AND METHODS. Twenty implants (Implantium 3.4 mm, Dentium, Seoul, Korea) were divided into 2 groups (n = 20). In the first group, an adhesive material was applied around the screw of the abutments (test group). In the second group, the screws are soaked in saliva (control group). All the screws were torqued under 30 N/cm, Then, the samples were gone through a cyclic fatigue loading process. After cyclic loading, we detorqued screws and calculated detorque value. RESULTS. In comparison with the control group, all the implant screws in the test group were smeared with the adhesive material, showing significant higher detorque value. CONCLUSION. There are significantly higher detorque values in the group with adhesive. It is recommended to make biocompatible adhesive to reduce screw loosening.

Design of Sierpinski Carpet Fractal Antennas by Improving the Performance and Reducing the Size for Wide Band and Mobile Applications

Arshad Wahab,Xu Jiadong 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8

The paper presents the designs of two Sierpinski carpet fractal antennas. The fractal properties have been applied in order to designs compact and wideband antennas. The antennas are analyzed in term of radiation parameters such as reflection coefficients, voltage standing wave ratio and radiation patterns. The results shows that the bandwidths of the antennas at the reflection coefficient less than -10dB are 5.5GHz and 7.25GHz ranging from 8.3GHz to 2.8GHz and 4.75GHz to 12GHz respectively. The directivities of antenna are 5.109dBi, 6.952dBi, 6.696dBi and the gains are 5.11dBi, 6.95dBi, and 6.7dBi. The bandwidth is largest at high resonance points with increasing the number of iterations. The proposed designs are suitable for wireless applications such as Wi-Fi, WiMAX, WLAN, Bluetooth, WCDMA and GSM.

Analysis of multiscale mortar mixed approximation of nonlinear elliptic equations

Arshad, Muhammad,Park, Eun-Jae,Shin, Dong-wook Elsevier 2018 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.75 No.2

<P><B>Abstract</B></P> <P>A multiscale mortar mixed finite element method is established to approximate non-linear second order elliptic equations. The method is based on non-overlapping domain decomposition and mortar finite element methods. The existence and uniqueness of the approximation are demonstrated, and a priori <SUP> L 2 </SUP> -error estimates for the velocity and pressure are derived. An error bound for mortar pressure is proved. Convergence estimates of the mortar pressure are based on a linear interface formulation having the discrete-pressure dependent coefficient. Optimal order convergence is achieved on the fine scale by a proper choice of mortar space and polynomial degree of approximation. The quadratic convergence of the Newton–Raphson method is proved for the nonlinear algebraic system arising from the mortar mixed formulation of the problem. Numerical experiments are performed to support theoretic results.</P>

Leader-following formation and heading control of networked quadcopters

Arshad Mahmood,Yoonsoo Kim 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10