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.

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.

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.

FIXED POINT THEOREMS IN ORDERED DUALISTIC PARTIAL METRIC SPACES

Arshad, Muhammad,Nazam, Muhammad,Beg, Ismat The Kangwon-Kyungki Mathematical Society 2016 한국수학논문집 Vol.24 No.2

In this article, we introduce the concept of ordered dualistic partial metric spaces and establish an order relation on quasi dualistic partial metric spaces. Later on, using this order relation, we prove xed point theorems for single and multivalued mappings. We support our results with some illustrative examples.

Adaptive Real-Time Ship Detection and Tracking Using Morphological Operations

Arshad, Nasim,Moon, Kwang-Seok,Kim, Jong-Nam The Korea Institute of Information and Commucation 2014 Journal of information and communication convergen Vol.12 No.3

In this paper, we propose an algorithm that can efficiently detect and monitor multiple ships in real-time. The proposed algorithm uses morphological operations and edge information for detecting and tracking ships. We used smoothing filter with a $3{\times}3$ Gaussian window and luminance component instead of RGB components in the captured image. Additionally, we applied Sobel operator for edge detection and a threshold for binary images. Finally, object labeling with connectivity and morphological operation with open and erosion were used for ship detection. Compared with conventional methods, the proposed method is meant to be used mainly in coastal surveillance systems and monitoring systems of harbors. A system based on this method was tested for both stationary and non-stationary backgrounds, and the results of the detection and tracking rates were more than 97% on average. Thousands of image frames and 20 different video sequences in both online and offline modes were tested, and an overall detection rate of 97.6% was achieved.

Fabrication and Characterization of Carbon Nanotube/Ceramic Nanocomposite Powders

Arshad N.,Cha Seung-Il,Kim Kyung-Tae,Hong Soon-Hyung 한국분말야금학회 2004 한국분말야금학회 학술대회논문집 Vol.2004 No.1

Overview of Benign and Malignant Prostatic Disease in Pakistani Patients: A Clinical and Histopathological Perspective

Arshad, Huma,Ahmad, Zubair Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5

Background: To present the overall clinical and histological perspective of benign and malignant prostatic disease as seen in our practice in the Section of Histopathology, Department of Pathology and Microbiology, Aga Khan University Hospital, Karachi, Pakistan. Materials and Methods: All consecutive prostate specimens (transurethral resection or TUR, enucleation, needle biopsies) received between July 1, 2012 and December 31, 2012 were included in the study. Results: Of the total of 785 cases, 621 (79.1%) were TUR specimens, 80 (10.2%) enucleation specimens, and 84 (10.7%) needle biopsies. Some 595 (75.8%) were benign, while 190 (24.2%) were malignant. Mean weight of BPH specimens was 19 grams and 43 grams for TUR and enucleation specimens respectively. Almost 67% of adenocarcinomas were detected on TUR or enucleation specimens. Of the above cases, 41.7% were clinically benign while 58.3% were clinically malignant. The average volume of carcinoma in all cases ranged between 60 to 65%. The average number of cores involved in needle biopsies was 5. In general, higher Gleason scores were seen in TUR/enucleation specimens than in needle biopsies. Overall, in all types of specimens, commonest Gleason score was 7, seen in 74 (38.9%) cases, followed by Gleason score 9 seen in 47 (24.7%) cases. Out of the 63 needle biopsies with carcinoma, radical prostatectomy was performed in 16 cases (25.4%). Conclusions: Benign prostatic hyperplasia (BPH) is extremely common and constitutes the bulk of prostate specimens. TMajority of prostatic carcinomas are still diagnosed on TUR or enucleation specimens. These included both clinically benign and clinically malignant cases. The volume of carcinoma in these specimens was quite high indicating extensive disease. Gleason scores were also generally high compared with scores from needle biopsies. Commonest Gleason score in all type of specimens was 7. Pathologic staging was possible in very few cases since radical prostatectomies are rarely performed.

Digital Forensics: Review of Issues in Scientific Validation of Digital Evidence

Arshad, Humaira,Jantan, Aman Bin,Abiodun, Oludare Isaac Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.2

Digital forensics is a vital part of almost every criminal investigation given the amount of information available and the opportunities offered by electronic data to investigate and evidence a crime. However, in criminal justice proceedings, these electronic pieces of evidence are often considered with the utmost suspicion and uncertainty, although, on occasions are justifiable. Presently, the use of scientifically unproven forensic techniques are highly criticized in legal proceedings. Nevertheless, the exceedingly distinct and dynamic characteristics of electronic data, in addition to the current legislation and privacy laws remain as challenging aspects for systematically attesting evidence in a court of law. This article presents a comprehensive study to examine the issues that are considered essential to discuss and resolve, for the proper acceptance of evidence based on scientific grounds. Moreover, the article explains the state of forensics in emerging sub-fields of digital technology such as, cloud computing, social media, and the Internet of Things (IoT), and reviewing the challenges which may complicate the process of systematic validation of electronic evidence. The study further explores various solutions previously proposed, by researchers and academics, regarding their appropriateness based on their experimental evaluation. Additionally, this article suggests open research areas, highlighting many of the issues and problems associated with the empirical evaluation of these solutions for immediate attention by researchers and practitioners. Notably, academics must react to these challenges with appropriate emphasis on methodical verification. Therefore, for this purpose, the issues in the experiential validation of practices currently available are reviewed in this study. The review also discusses the struggle involved in demonstrating the reliability and validity of these approaches with contemporary evaluation methods. Furthermore, the development of best practices, reliable tools and the formulation of formal testing methods for digital forensic techniques are highlighted which could be extremely useful and of immense value to improve the trustworthiness of electronic evidence in legal proceedings.

Optical in situ monitoring of plasma-enhanced atomic layer deposition process

Arshad, Muhammad Zeeshan,Jo, Kyung Jae,Kim, Hyun Gi,Hong, Sang Jeen Institute of Pure and Applied Physics 2018 Japanese Journal of Applied Physics Vol. No.