37 results on '"Arshad, Zafar"'
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2. Correction: Lee et al. Porous Aerogel Structures as Promising Materials for Photocatalysis, Thermal Insulation Textiles, and Technical Applications: A Review. Catalysts 2023, 13, 1286
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Lee, Kang Hoon, primary, Arshad, Zafar, additional, Dahshan, Alla, additional, Alshareef, Mubark, additional, Alsulami, Qana A., additional, Bibi, Ayesha, additional, Lee, Eui-Jong, additional, Nawaz, Muddasir, additional, Zubair, Usman, additional, and Javid, Amjed, additional
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- 2023
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3. Optimized Cu-doping in ZnO electro-spun nanofibers for enhanced photovoltaic performance in perovskite solar cells and photocatalytic dye degradation.
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Kang Hoon Lee, Farheen, Rabeea, Arshad, Zafar, Ali, Mumtaz, Hassan, Hamza, Alshareef, Mubark, Dahshan, A., and Khalid, Usama
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- 2024
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4. The Comparison of Metal Doped TiO2 Photocatalytic Active Fabrics under Sunlight for Waste Water Treatment Applications
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Lee, Kang Hoon, primary, Arfa, Ume, additional, Arshad, Zafar, additional, Lee, Eui-Jong, additional, Alshareef, Mubark, additional, Alsowayigh, Marwah M., additional, Shahid, Kinza, additional, Shahid, Raghisa, additional, and Hamad, N., additional
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- 2023
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5. Enhancing the Thermal Comfort of Woven Fabrics and Mechanical Properties of Fiber-Reinforced Composites Using Multiple Weave Structures
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Arshad, Zafar, primary and Alharthi, Salman S., additional
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- 2023
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6. Porous Aerogel Structures as Promising Materials for Photocatalysis, Thermal Insulation Textiles, and Technical Applications: A Review.
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Lee, Kang Hoon, Arshad, Zafar, Dahshan, Alla, Alshareef, Mubark, Alsulami, Qana A., Bibi, Ayesha, Lee, Eui-Jong, Nawaz, Muddasir, Zubair, Usman, and Javid, Amjed
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THERMAL insulation , *AEROGELS , *INSULATING materials , *PHOTOCATALYSIS , *THERMAL conductivity , *RAW materials , *THERMAL properties - Abstract
Aerogels, due to their unique features like lightweight, ultra-low thermal conductivity, and design variations, have gotten a lot of interest in thermal insulation, photocatalysis, and protective areas. Besides their superior thermal properties, aerogel thermal insulation and photocatalyst materials also possess many inherent flaws, such as handling issues, high manufacturing costs, and low strength as well as toughness. The most persuasive and successful ways to improve photocatalytic and thermal insulating qualities while lowering costs are composition optimization and microstructure reconstruction. Their high surface area and porosity make them ideal for enhancing the efficiency and capacity of these devices. Research may lead to more efficient and longer-lasting energy storage solutions. This review describes the characteristics, microstructural reconstruction, design variation, and properties of all aerogel fabrication techniques and provides a comprehensive overview of scientific achievements linked to them. The effectiveness of raw material compositions, properties, and mechanical parameters are also discussed. The major goal of this review is to highlight the aerogel-based materials and design variations and to explore the most potential development trends for photocatalysis and thermal applications. The industrial as well as technical applications of silica aerogels are also highlighted. This review highlights futuristic applications of aerogel-based textile materials to alleviate the CO2 burden on our atmosphere, either by providing next-level thermal insulation or by employing them in CO2 mitigating technologies such as CO2 capture. [ABSTRACT FROM AUTHOR]
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- 2023
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7. The Comparison of Metal Doped TiO 2 Photocatalytic Active Fabrics under Sunlight for Waste Water Treatment Applications.
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Lee, Kang Hoon, Arfa, Ume, Arshad, Zafar, Lee, Eui-Jong, Alshareef, Mubark, Alsowayigh, Marwah M., Shahid, Kinza, Shahid, Raghisa, and Hamad, N.
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WASTE treatment ,SEWAGE ,WATER purification ,TITANIUM dioxide ,SILANE coupling agents ,PLASTIC marine debris - Abstract
The release of toxic effluents and microfibers during the frequent washings of textiles poses a major threat to the environment. On the one hand, the detrimental effluents from detergents pose a threat to marine biota in peril, and on the other, microplastics have even been found in breastmilk. According to this study, functionalized metal-doped TiO
2 nanoparticles can be immobilized to create fabrics that are hygienic and antibacterial. There is a need to reduce the amount of different detergents, surfactants and chemicals used to remove stains. The manufacture of pristine and Cu-, Ag- and Zn-doped TiO2 nanoparticles having trace molar ratios of dopant chosen with a simple sol–gel approach using pad–dry–cure silane coupling agents, firstly with the functionalization and then the immobilization of nanoparticles, was successfully performed on cotton fabric. The as-obtained fabrics were evaluated for their crystallinity, chemical functionalities, surface morphologies and elemental compositions. The photodegradation potentials of unfunctionalized materials were assessed in ambient sunshine against five commercial colors. Within three hours of sunshine exposure, according to color strength analysis and antibactericidal activities, 95–98% of the dye was degraded from the functionalized fabric surface. Additionally, the treated content kept its mechanical and comfort qualities. [ABSTRACT FROM AUTHOR]- Published
- 2023
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8. Room Temperature Synthesized TiO2 Nanoparticles for Two-Folds Enhanced Mechanical Properties of Unsaturated Polyester
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Shoaib, Muhammad, primary, Latif, Zeeshan, additional, Ali, Mumtaz, additional, Al-Ghamdi, Ahmed, additional, Arshad, Zafar, additional, and Wageh, S., additional
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- 2023
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9. Efficient Tuning of the Opto-Electronic Properties of Sol–Gel-Synthesized Al-Doped Titania Nanoparticles for Perovskite Solar Cells and Functional Textiles
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Alsulami, Qana A., primary, Arshad, Zafar, additional, Ali, Mumtaz, additional, and Wageh, S., additional
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- 2023
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10. Partial Oxidation of Methane over CaO Decorated TiO2 Nanocatalyst for Syngas Production in a Fixed Bed Reactor
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Khoja, Asif Hussain, primary, Javed, Ahad Hussain, additional, Naqvi, Salman Raza, additional, Shakir, Sehar, additional, Ud Din, Israf, additional, Arshad, Zafar, additional, Rashid, Umer, additional, Qazi, Umair Yaqub, additional, and Naeem, Nida, additional
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- 2022
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11. Comparison of Electrospun Titania and Zinc Oxide Nanofibers for Perovskite Solar Cells and Photocatalytic Degradation of Methyl Orange Dye.
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Arshad, Zafar, Ali, Mumtaz, Lee, Eui-Jong, Alshareef, Mubark, Alsowayigh, Marwah M., Shahid, Kinza, Shahid, Raghisa, and Lee, Kang Hoon
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SOLAR cells , *PHOTODEGRADATION , *NANOFIBERS , *ZINC oxide , *DYES & dyeing , *SCANNING electron microscopes , *ELECTRON transport - Abstract
ZnO and TiO2 are both well-known electron transport materials; however, an exact comparison of their performance, when fabricated under the same synthesis conditions, is missing in the literature. Considering this, we introduced a viable electrospinning route for the development of highly polycrystalline TiO2 and ZnO nanofibers for an electron transport material (ETM) of perovskite solar cells and photocatalysts for textiles. Thanks to the effective tuning of band structure and morphology of TiO2, a significant improvement in performance as compared to ZnO was observed when both were used as photoanodes and photocatalysts. X-ray diffraction detected polycrystalline structural properties and showed that peaks are highly corresponding to TiO2 and ZnO. Morphological analysis was carried out with a scanning electron microscope, which revealed that nanofibers are long, uniform, and polycrystalline, having diameter in the nano regime. TiO2 nanofibers are more aligned and electron-supportive for conduction as compared to ZnO nanofibers, which are dense and agglomerated at some points. Optoelectronic properties showed that TiO2 and ZnO show absorption values in the range of ultraviolet, and visible range and band gap values for TiO2 and ZnO were 3.3 and 3.2 eV, respectively. The TiO2 band gap and semiconductor nature was more compatible for ETL as compared to ZnO. Electrical studies revealed that TiO2 nanofibers have enhanced values of conductivity and sheet carrier mobility as compared to ZnO nanofibers. Therefore, a higher photovoltaic conversion efficiency and antibacterial activity was achieved for TiO2 nanofibers (10.33%), as compared to ZnO (8.48%). In addition, the antibacterial activity of TiO2 was also recorded as better than ZnO. Similarly, compared to ZnO nanofibers, TiO2 nanofibers possess enhanced photoactivity for antimicrobial and dye degradation effects when applied to fabrics. [ABSTRACT FROM AUTHOR]
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- 2023
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12. Partial oxidation of methane over CaO decorated TiO2 nanocatalyst for syngas production in a fixed bed reactor
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Khoja, Asif Hussain, Javed, Ahad Hussain, Naqvi, Salman Raza, Shakir, Sehar, Ud Din, Israf, Arshad, Zafar, Rashid, Umer, Qazi, Umair Yaqub, Naeem, Nida, Khoja, Asif Hussain, Javed, Ahad Hussain, Naqvi, Salman Raza, Shakir, Sehar, Ud Din, Israf, Arshad, Zafar, Rashid, Umer, Qazi, Umair Yaqub, and Naeem, Nida
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Syngas is a valuable entity for downstream liquid fuel production and chemical industries. The efficient production of syngas via catalytic partial oxidation of methane (CPOM) is an important process. In this study, partial oxidation of methane (POM) was carried out using CaO decorated TiO2 catalysts. The catalysts were synthesized employing the sol-gel method, while the decoration of TiO2 with CaO was achieved in an aqueous solution by wetness impregnation method. The prepared catalysts were characterized by employing XRD, Raman, TG-DTG, and SEM-EDX for structural and morphological analysis. On testing for POM, at 750 °C the catalysts demonstrate excellent CH4 conversion of 83.6 and 79.5% for 2% and 3% CaO loaded TiO2, respectively. While the average H2/CO ratio for both 2% and 3% CaO loaded TiO2, 2.25 and 2.28, respectively, remained slightly above the theoretical value (H2/CO = 2.0) of POM. The improved POM performance is attributed to the optimally loaded CaO on the TiO2 surface that promotes the reaction where TiO2 support ensure less agglomerated particles, resulting into a fine distribution of the active catalytic sites.
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- 2022
13. Performance Analysis of Calcium-Doped Titania (TiO2) as an Effective Electron Transport Layer (ETL) for Perovskite Solar Cells
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Arshad, Zafar, primary, Shakir, Sehar, additional, Khoja, Asif Hussain, additional, Javed, Ahad Hussain, additional, Anwar, Mustafa, additional, Rehman, Abdur, additional, Javaid, Rahat, additional, Qazi, Umair Yaqub, additional, and Farrukh, Sarah, additional
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- 2022
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14. Efficient Electron Extraction and Transport in Aluminium Doped Titania Nanoparticles for Perovskite Solar Cells and Antibacterial Textiles
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arshad, zafar, primary, Ahmed, Adnan, additional, Wageh, S., additional, Maiyalagan, T, additional, al. masri, walaa, additional, Saleem, rubab, additional, and Ali, Mumtaz, additional
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- 2022
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15. Room Temperature Synthesized TiO 2 Nanoparticles for Two-Folds Enhanced Mechanical Properties of Unsaturated Polyester.
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Shoaib, Muhammad, Latif, Zeeshan, Ali, Mumtaz, Al-Ghamdi, Ahmed, Arshad, Zafar, and Wageh, S.
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UNSATURATED polyesters ,TITANIUM dioxide ,COMPOSITE structures ,STRESS concentration ,NANOPARTICLES ,POLYESTERS ,POLYMERIC nanocomposites - Abstract
Using of nano-inclusion to reinforce polymeric materials has emerged as a potential technique to achieve an upper extreme of specific strength. Despite the significant improvement of mechanical properties via nano-reinforcements, the commercial application of such nano-composites is still restricted, due to high cost and unwanted aggregation of nanoparticles in the polymer matrix. To address these issues, here we proposed a scalable and economical synthesis of TiO
2 at low temperatures, resulting in self-dispersed nanoparticles, without any surfactant. As lower energy is consumed in the synthesis and processing of such nanoparticles, so their facile gram-scale synthesis is possible. The defect-rich surface of such nanoparticles accommodates excessive dangling bonds, serving as a center for the functional groups on the surface. Functional surface enables high dispersion stability of room temperature synthesized TiO2 particles. With this motivation, we optimized the processing conditions and concentration of as-synthesized nano-particles for better mechanical properties of unsaturated polyester (UP) resin. The composite structure (UP-TiO2 ) showed nearly two folds higher tensile, flexural, and impact strength, with 4% content of nanoparticles. Characterization tools show that these better mechanical properties are attributed to a strong interface and superior dispersion of nanoparticles, which facilitate better stress distribution in the composite structure. In addition, the crack generation and propagation are restricted at a much smaller scale in nanocomposites, therefore significant improvement in mechanical properties was observed. [ABSTRACT FROM AUTHOR]- Published
- 2023
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16. Partial Oxidation of Methane over CaO Decorated TiO 2 Nanocatalyst for Syngas Production in a Fixed Bed Reactor.
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Khoja, Asif Hussain, Javed, Ahad Hussain, Naqvi, Salman Raza, Shakir, Sehar, Ud Din, Israf, Arshad, Zafar, Rashid, Umer, Qazi, Umair Yaqub, and Naeem, Nida
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FIXED bed reactors ,SYNTHESIS gas ,TITANIUM dioxide ,PARTIAL oxidation ,LIQUID fuels ,CHEMICAL industry ,METHANE - Abstract
Syngas is a valuable entity for downstream liquid fuel production and chemical industries. The efficient production of syngas via catalytic partial oxidation of methane (CPOM) is an important process. In this study, partial oxidation of methane (POM) was carried out using CaO decorated TiO
2 catalysts. The catalysts were synthesized employing the sol-gel method, while the decoration of TiO2 with CaO was achieved in an aqueous solution by wetness impregnation method. The prepared catalysts were characterized by employing XRD, Raman, TG-DTG, and SEM-EDX for structural and morphological analysis. On testing for POM, at 750 °C the catalysts demonstrate excellent CH4 conversion of 83.6 and 79.5% for 2% and 3% CaO loaded TiO2 , respectively. While the average H2 /CO ratio for both 2% and 3% CaO loaded TiO2 , 2.25 and 2.28, respectively, remained slightly above the theoretical value (H2 /CO = 2.0) of POM. The improved POM performance is attributed to the optimally loaded CaO on the TiO2 surface that promotes the reaction where TiO2 support ensure less agglomerated particles, resulting into a fine distribution of the active catalytic sites. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
17. Enhanced charge transport characteristics in zinc oxide nanofibers via Mg2+ doping for electron transport layer in perovskite solar cells and antibacterial textiles.
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Arshad, Zafar, Wageh, S., Maiyalagan, T., Ali, Mumtaz, Arshad, Umair, Noor-ul-ain, Qadir, Muhammad Bilal, Mateen, Fahad, and Al-Sehemi, Abdullah G.
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ELECTRON transport , *SOLAR cells , *CHARGE carrier mobility , *NANOFIBERS , *PEROVSKITE , *ZINC oxide , *OPTICAL rotation - Abstract
ZnO is well-known electron transport material; however, its charge carrier mobility is restricted due to lower conductivity and hysteresis losses. To overcome these issues, 1–3 wt% Mg-doped ZnO nanofibers were synthesized via electrospinning and then applied as electron transport layer (ETL) of perovskite solar cell. The structural, morphological, chemical composition, electronic structure, and optical activity of the synthesized nanofibers were studied to elucidate the role of Mg doping. X-ray diffraction of all nanofibers revealed that Mg was successfully incorporated into ZnO lattice and revealed that ZnO is present in hexagonal wurtzite structure. Optical characterization of the nanofibers revealed that with an increase in Mg2+ doping concentration, the bandgap energy (Eg) tuned from 3.36 eV to 2.8 eV. It was observed that doping ZnO matrix with Mg ions improved the electronic structure, hence favoring the increase in the fill factor, current density, and efficiency. By doping 1, 2, and 3 wt% Mg into ZnO, efficiency was increased up to 8.48, 10.33, and 13.52%, respectively. Thus, a significant improvement in the performance of ZnO was noted by our proposed facile Mg doping. In addition, a significant improvement in photocatalytic activity was observed in Mg doped ZnO, which was used for fabrication of antibacterial textiles. [ABSTRACT FROM AUTHOR]
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- 2022
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18. Magnesium doped TiO2 as an efficient electron transport layer in perovskite solar cells
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Arshad, Zafar, primary, Khoja, Asif Hussain, additional, Shakir, Sehar, additional, Afzal, Asif, additional, Mujtaba, M.A., additional, Soudagar, Manzoore Elahi M., additional, Fayaz, H., additional, Saleel C, Ahamed, additional, Farukh, Sarah, additional, and Saeed, Mudassar, additional
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- 2021
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19. Correction: Optimized Cu-doping in ZnO electro-spun nanofibers for enhanced photovoltaic performance in perovskite solar cells and photocatalytic dye degradation.
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Lee, Kang Hoon, Farheen, Rabeea, Arshad, Zafar, Ali, Mumtaz, Hassan, Hamza, Alshareef, Mubark, Dahshan, A., and Khalid, Usama
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- 2024
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20. Surgical management of tuberculous small bowel obstruction
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Mohammad, Akbar, Fakhar-ul-Islam, Irfan Zaffar, Haider, Danish, Naveed, Ismail, Akbar, Irfanuddin, Khattak, Kehkashan, Akbar, and Arshad, Zafar
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Adult ,Cohort Studies ,Male ,Young Adult ,Adolescent ,Tuberculosis, Gastrointestinal ,Intestine, Small ,Humans ,Female ,Middle Aged ,Intestinal Obstruction - Abstract
Acute intestinal obstruction due to tuberculosis is a common surgical problem in our community. Emergency surgery is usually required and surgical procedure depends upon the location and extent of the disease. The aim of this study was to determine the commonly involved region of intestine and different surgical procedures tailored.Thirty patients operated upon for acute intestinal obstruction in emergency with operative and histopathological findings suggestive of tuberculosis were included in the study. Demographic profile, operative findings, details of surgical procedure, complications and post-op hospital stay were recorded. The patients were followed for 6 months.Intestinal tuberculosis is more common in young female, with male to female ratio of 1:1.5. Stricture of the small bowel was found in 50% of the cases. The next common finding was ileocaecal tuberculosis found in 40% of patients. Strictruplasty was performed in 11 (36.33%). The right hemicolectomy, limited ileocaecal resection and segmental bowel resection with end to end anastomosis were performed in four patients each. Other procedures were release of adhesions and bands in 4 patients, ileotransverse bypass in 1 patient and loop ileiostomy in 2 patients. Major complication in 10 patient and mortality rate was 10%.Because of non-specific clinical features, ignorance and malpractice intestinal tuberculosis presents late. Ileocecal tuberculosis is becoming less common as compared to small bowel strictures. Less radical surgery gives better results. Post operative complications and mortality are related to the perforation of the intestine at the time of surgery.
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- 2011
21. Palliative surgery for intestinal obstruction due to recurrent ovarian cancer
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Zahida, Parveen, Ahmad Nadeem, Qureshi, Mohammad, Akbar, Arshad, Zafar, and Aqeel, Subhani
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Ovarian Neoplasms ,Laparotomy ,Risk Factors ,Palliative Care ,Humans ,Female ,Pakistan ,Tissue Adhesions ,Length of Stay ,Neoplasm Recurrence, Local ,Intestinal Obstruction ,Peritoneal Neoplasms ,Retrospective Studies - Abstract
Intestinal Obstruction is a frequent complication after operation for Ovarian Cancer. This study was done to see the outcome of palliative surgery for Intestinal Obstruction due to recurrent ovarian Cancer.We retrospectively evaluated the records of all the patients who presented with intestinal obstruction after operations for Ovarian Cancer in all the three Surgical Units of Ayub Teaching Hospital Abbottabad from March 1998 to April, 2009. Demographic data, type of management, morbidity, mortality, hospital stay, surgical procedure, symptomatic relief, return of bowel function and outcome were analyzed.There were 56 patients with symptoms of partial or complete intestinal obstruction. Conservative treatment was successful in 22 (39%) patients. Laparotomy was done in 30 (53.5%) patients. The cause of intestinal obstruction was adhesions 8 (26.6%), local recurrence 10 (33.3%) and diffuse carcinomatosis in 12 (40%) patients. Palliative surgery was done in 20 (66.6%) patients while 8 (26.6%) had adhesionolysis only. 9 (30%) patients had resection and anastomosis, 7 (23.3%) had bypass surgery, 3 (10%) had colostomy and one (3%) had Hartmann procedure. Postoperative complications occurred in 26 (86.6%) patients. 12 (40 %) patients died after surgery. Mean hospital stay was 18 (9-42) days. Palliative surgery was successful in 8 (26.65%).Majority of patients with Intestinal obstruction after operation for Ovarian Cancer can be managed conservatively. Palliative surgery is associated with high mortality and morbidity but it should be done in patients not responding to conservative measures.
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- 2010
22. Re-do orchidopexy in a general surgical unit-reliability of clinical diagnosis and the outcome of surgery
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Irfanud Din, Khattak, Arshad, Zafar, Ishtiaq Ali, Khan, Muhammad, Akbar, Muhammad, Owais, and Shahzad, Ahmad
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Male ,Reoperation ,Cross-Sectional Studies ,Treatment Outcome ,Child, Preschool ,Humans ,Infant ,Child ,Orchiectomy - Abstract
Re-do Orchidopexy is not very common, expertise is limited and the results of clinical examination and ultrasonography are not always reliable.This cross-sectional study was based on medical records of patients under-going re-exploration of inguinal region for a missing testicle after previous groin surgery, and no mention of orchidectomy. All patients were thoroughly examined, investigated with ultrasonography and offered re-exploration. Results were graded as Good, Fair and Poor.Out of 11 boys included in the study, 7 (63.63%) had failed orchidopexy. Another 3 (27.27%) were opened for 2nd stage orchidopexy and 1 (9.09%) had iatrogenic ascent of testis after herniotomy. On clinical examination 4 (36.36%) had a palpable testicle at the superficial ring, 2 (18.18%) were in inguinal canal (1 doubtful!), and no testicle could be palpated in 5 (45.45%). Ultrasonography picked up 2 testicles (18.18%) at the superficial Inguinal ring, 1 (9.09%) in Inguinal canal and 1 (9.09%) testicle in the abdominal cavity. On reexploration, 10 (90.9%) testicles were found and brought down, 7 (63.63%) being considered of reasonable consistency and size. Another 3 (27.27%) were considered soft or small in size, and in 1 (9.09%)), no testicle was found. In 5 patients (45.45%), the testicle was at superficial ring, in 3 (27.27%) in the inguinal canal, and in 2 (18.18%) in the abdominal cavity. Results were considered good in 6 (54.54%), fair in 3 (27.27%)) and poor in 2 (18.18%).Groin examination after previous inguinal surgery is tricky. Ultrasonography is also not very reliable. Re-exploration via the inguinal approach is adequate and recommended. Thorough exploration is essential before declaring the testicle absent
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- 2009
23. Aspiration and tetracycline sclerotherapy of primary vaginal hydrocoele of testis in adults
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Johar, Ali, Waqas, Anwar, Mohammad, Akbar, Syed Ali, Akbar, and Arshad, Zafar
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Male ,Protein Synthesis Inhibitors ,Sclerotherapy ,Testis ,Humans ,Prospective Studies ,Middle Aged ,Suction ,Tetracycline ,Aged ,Anti-Bacterial Agents ,Testicular Hydrocele ,Ultrasonography - Abstract
Primary Vaginal Hydrocoele of Testis is a common condition which is primarily treated surgically. Many patients with Hydrocoele of testis are either not willing or are unfit for surgery. This study was done to know the safety, efficacy and out come of tetracycline induced sclerotherapy of Primary Vaginal Hydrocoele of Testis in adults.This quasi experimental study was done in Shahina Jamil Hospital, attached with Frontier Medical College and Ayub Teaching Hospital, Abbottabad from March 2006 to April, 2007. Thirty-seven patients with primary vaginal hydrocoele were included in the study. Aspiration and instillation of Tetracycline was done after spermatic cord block with 2% lignocaine. Procedure time, Peri and Post-procedure complications, number of injections for cure and patients' satisfaction with the procedure were recorded. Patients were discharged home 3 to 4 hours after the procedure and followed up after one week, one month, three months and six months. Direct admission and re-admissions were recorded.The mean age of patients was 47 years. Mean procedure time was 45 minutes. All patients were cured. Mild postoprocedure pain occurred in 12 (40%), moderate pain in 14 (46%) patients and severe pain in 4 (13.3%) patients. No patient developed haematoma or local infection. One patient (3.3%) had micturition problem. Two (6.6%) patients had minimal recurrence. One injection was sufficient for cure in all patients. 28 (93%) patients were satisfied while 2 (6.6%) patients were not satisfied with this procedure. No patient was admitted in the hospital after the procedure.Aspiration and injection of tetracycline in Primary vaginal Hydrocoele of Testis in adults is safe, effective and very economical procedure.
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- 2009
24. Laparoscopic cholecystectomy: an early experience at Ayub Teaching Hospital Abbottabad
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Tariq Saeed, Mufti, Sajjad, Ahmad, Danish, Naveed, Muhammad, Akbar, and Arshad, Zafar
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Adult ,Male ,Adolescent ,Gallbladder Diseases ,Middle Aged ,Cohort Studies ,Treatment Outcome ,Cholecystectomy, Laparoscopic ,Humans ,Female ,Pakistan ,Clinical Competence ,Hospitals, Teaching ,Aged ,Retrospective Studies - Abstract
Laparoscopic Cholecystectomy first introduced in 1987, is becoming more and more popular and now it has become gold standard in symptomatic gallstone disease. The current descriptive study is carried out in Department of General Surgery, Ayub Teaching hospital, Abbottabad to evaluate the result of Laparoscopic Cholecystectomy in symptomatic gallstones disease in our set up with special emphasis on complication rate, morbidity and mortality.The data of all patients who underwent Laparoscopic Cholecystectomy form January to December 2007 was entered in standardized proforma and analysed on SPSS 10.Out of 60 patients, 51 (85%) were female and 9 (15%) were males; the age range from 17 to 65 years mean age being 40.30 years, majority were in age 30-40 years group. Two (3.3%) patients had bile leak, 1 (1.3%) patient developed port site wound infection 1 (1.3%) patient developed collection in pouch of Morrison and in 1 (1.3%) patient stone were recovered from the epigastric port site wound. There was no bile duct or colonic injuries. The conversion rate was 5%. There was no mortality.Laparoscopic cholecystectomy is a safe and effective treatment for gall stone disease and is up to the accepted standard in our set up as compared to national and international data.
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- 2008
25. Conservative management of mesh site infection in ventral hernia repair
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Sajjad, Ahmad, Tariq Saeed, Mufti, Arshad, Zafar, and Ismail, Akbar
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Adult ,Cohort Studies ,Male ,Debridement ,Humans ,Surgical Wound Infection ,Female ,Pakistan ,Middle Aged ,Surgical Mesh ,Hernia, Ventral ,Anti-Bacterial Agents - Abstract
Mesh Hernioplasty is the preferred surgical procedure for abdominal wall hernias and infection remains one of the most common complications of this technique. In some patients the mesh may need removal to overcome infection, where as others may be salvaged by conservative treatment. This study was conducted to assess the outcome of conservative management for mesh site infection in abdominal wall hernia repairs.This study was carried out in Ayub Teaching Hospital Abbottabad Pakistan from Jan 2006 to Dec 2007. Thirteen consecutive cases were included, who developed mesh site infection after abdominal wall hernia repair. Pus or purulent fluid was sent for culture and sensitivity. All patients were treated by intravenous antibiotics and local wound care. Treatment was taken as successful when there was complete resolution of infection and healing of the wound.There were 7 inguinal (53.84%), 4 para-umbilical (30.76%) and 2 incisional hernias (15.38%). Eight patients were males (61.53%) and 5 females (38.46%). Median age of the patients was 40 years (range 28 to 52 years). Staphylococcus aureus was the most commonly found organism causing infection in 8 patients, (76.9%). Mean hospital stay was 22 days (range 18-26 days). All cases were effectively treated conservatively without removing the mesh. Polypropylene mesh was used in all of these cases.Conservative management is likely to be successful in mesh site infection in abdominal wall hernia repairs.
- Published
- 2008
26. Cancelled elective general surgical operations in Ayub Teaching Hospital
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Arshad, Zafar, Tariq Saeed, Mufti, Samson, Griffin, Sajjad, Ahmed, and Johar Ali, Ansari
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Medical Audit ,Operating Rooms ,Patient Dropouts ,Patients ,Elective Surgical Procedures ,Hospital Bed Capacity ,Humans ,Equipment Failure ,Pakistan ,Hospitals, Teaching ,Retrospective Studies - Abstract
Cancellation of operations in hospitals is a significant problem with far reaching consequences. This study was planned to evaluate reasons for cancellation of elective surgical operation on the day of surgery in Ayub Teaching Hospital, Abbottabad.From July 2006 to June 2007 the medical records of all the patients who had their operations cancelled on the day of surgery in all the three General Surgical units of Ayub Teaching Hospital, Abbottabad were audited prospectively. The number of operation cancelled and reasons for cancellations were documented.3756 patients were scheduled for surgery during the study period. 2820 (75%) patients were operated upon. 936 (25%) operations were cancelled out of which 338 (36%) were cancelled due to shortage of time, 296 (31.6%) were cancelled due to medical reasons, 152 (16.2%) were cancelled due to shortage of beds while 55 (5.8%) were cancelled due to shortage of anaesthetists. Three operation lists were lost completely. The Anaesthetist cancelled 43%, Surgeon 39% while 18% of operations were cancelled due organizational reasons.Cancellation of patients on operation lists occupy a substantial population (25%) of cases. Majority of cancellation were due to reasons other than patients medical conditions. Better management could have avoided most of these cancellations.
- Published
- 2008
27. Combined abdominal hysterectomy, cholecystectomy and appendicectomy: a study of 25 cases in Abbottabad
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Samson, Griffin, Nasreen, Abbassi, Zahida, Parveen, Arshad, Zafar, and Johar, Ali
- Subjects
Adult ,Postoperative Complications ,Treatment Outcome ,Appendectomy ,Humans ,Cholecystectomy ,Female ,Pakistan ,Prospective Studies ,Length of Stay ,Middle Aged ,Hysterectomy - Abstract
Gallstone disease is common in women. Many patients undergoing abdominal ultrasound for gynaecological diseases are found to have gallstones. This study was done to see the results of combined abdominal hysterectomy, mini-cholecystectomy and appendicectomy in a set up lacking facilities of laparoscopic surgery.This prospective study was conducted in Ayub Teaching Hospital, Iltaf Hospital and Shahina Jamil Trust Hospital of Abbottabad from August 1998 to July 2004. All patients undergoing combined abdominal hysterectomy and mini-cholecystectomy were exclusively studied with reference to following variables. Age, Weight, Parity, Co-morbid conditions, peri-operative and post-operative complications, blood transfusion, hospital stay and mean extra time for mini-cholecystectomy and appendicectomy after abdominal hysterectomy.There were 25 patients in the study group. The ages ranged from 35-50 years. Mean weight was 65 Kg. There were no operative complications. Mild postoperative complications occurred in 7(28%) patients. Mean extra time for cholecystectomy was 25 minutes. Mean hospital stay was 9 days.In selected women, combined abdominal hysterectomy, cholecystectomy and appendicectomy is a safe, feasible and cost effective procedure.
- Published
- 2006
28. An audit of patients' satisfaction after adult day-case surgery at Ayub Teaching Hospital, Abbottabad
- Author
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Mukhtar, Ahmad, Arshad, Zafar, Samson, Griffin, Sajjad, Ahmad, Nasir, Orakzai, and Faisal, Fayyaz
- Subjects
Hospitals, University ,Ambulatory Surgical Procedures ,Patient Satisfaction ,Surveys and Questionnaires ,Humans ,Pakistan - Abstract
Day-case surgery has become an important component in the provision of surgical care in the Western countries. This study was done to introduce the concept of day-case surgery and assess the patients' satisfaction after day case general surgery in our set up with vast rural communities lacking medical facilities and no day-case surgery units in the hospitals.All those patients suitable for day-case surgery and who accepted day-case surgery for general surgical procedures in General Surgical 'A' unit of Ayub Teaching Hospital, Abbottabad were interviewed after the operation on follow up visits. Questions were asked about their satisfaction with day-case surgery. If they were not satisfied, the reasons for dissatisfaction were noted. Direct admissions and re-admissions after day-case surgery were recorded. Any complications in the postoperative period were also noted. The patient's preference for a similar procedure as day-case in future was also recorded.There were 122 patients in this study. 60(49%) were operated under general anesthesia and 62(51%) under local anesthesia. Fourty Nine (40%) patients were satisfied while 73(60%) were not satisfied with day-case surgery. Six (5%) patients were admitted directly after day-case surgery while 7(5.7%) patients were admitted after discharge. Complications occurred in 41(33.6%) patients at home. Wound complications and pain were the most common morbidity encountered by the patients. Twenty eight (23%) patients contacted a hospital or a doctor in the early postoperative period. Sixty two (51%) patients would prefer operation as in-patient while 74 (60.6 %) would prefer an overnight stay after the operation next time.Patients' satisfaction with day-case surgery in Ayub Teaching Hospital is not high. Short-stay surgery would be more appropriate in our set up.
- Published
- 2005
29. Accuracy of surgeon-performed abdominal utrasound for gallstones
- Author
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Sajjad, Ahmad, Arshad, Zafar, Mukhtar, Ahmad, Aamir, Ghafoor, Ehtisham, Malik, Adnan, Ali, and Umair Ahmed Saleem, Qazi
- Subjects
Adult ,Male ,General Surgery ,Humans ,Reproducibility of Results ,Female ,Gallstones ,Middle Aged ,Sensitivity and Specificity ,Aged ,Ultrasonography - Abstract
Gallstone disease is common in Pakistan. It is primarily diagnosed by ultrasonography. which is traditionally done by radiologists. If surgeons could perform ultrasonography, it would enable early diagnosis in one-stop clinic. This study was done to evaluate the accuracy of surgeon-performed abdominal ultrasonography to detect gallstones.This study was carried out at Surgical A and Surgical C units of Ayub Teaching Hospital, Abbottabad from July, 2000 to December, 2002. One hundred fourty two patients with signs and symptoms of gallstone disease who had ultrasonography performed by a surgeon. trained in ultrasonography were exclusively studied. These patients were referred for further scanning by the radiologists who were unaware of the surgeon's interpretation. The results of surgeon and radiologist performed ultrasonography were compared.The interpretation of surgeon-performed ultrasonography was correct in 100 patients and incorrect in 42 patients. There were 100 True Positive, 41 True Negative, One False Negative and Zero False Positive scans yielding 99%, Sensitivity, 100% Specificity and 99.3%, Accuracy. Sensitivity of surgeon-performed ultrasonography in detecting gallstones compared to operative findings was 100%.Abdominal ultrasonography performed by an ultrasonography trained surgeon can detect gallstones as accurately as by a radiologist.
- Published
- 2005
30. Gastrointestinal perforation in children due to blunt abdominal trauma in Hazara, Northern Pakistan
- Author
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Nasir Orakzai, Aamir Ghafoor, Arshad Zafar, and Sajjad Ahmad
- Subjects
Male ,medicine.medical_specialty ,030231 tropical medicine ,Perforation (oil well) ,Peritonitis ,Abdominal Injuries ,Wounds, Nonpenetrating ,03 medical and health sciences ,0302 clinical medicine ,Blunt ,Pneumoperitoneum ,Gastrointestinal perforation ,medicine ,Humans ,Pakistan ,030212 general & internal medicine ,Child ,Retrospective Studies ,business.industry ,Public Health, Environmental and Occupational Health ,Retrospective cohort study ,medicine.disease ,Surgery ,Infectious Diseases ,Abdominal trauma ,Intestinal Perforation ,Etiology ,Female ,business - Abstract
A retrospective study of 25 children with gastrointestinal perforation due to blunt abdominal trauma in a single region of Pakistan is presented. The age, sex, aetiology, site of perforation, abdominal and X-ray findings, associated injuries, surgical procedures and outcome were analysed. There were 20 boys and 5 girls: mean age was 10 years. The injuries were the result of road traffic accidents 12 (48%), falls 11 (44%) and ‘struck by animals’ two (8%). Associated injuries occurred in 19 (76%). On admission 20 (80%) patients had peritonitis while 18 (72%) had pneumoperitoneum. Mean time from trauma to admission was 10 hours and admission to operation was 5 hours. Ileum was the most common site of perforation. Simple closure was the most common surgical procedure. Complications occurred in nine (36%) patients — six (24%) died. Delay in presentation and operation was associated with increased morbidity and mortality. Frequent evaluation of the child and abdominal X-rays are still the important tools for early diagnosis of gastrointestinal perforation following blunt abdominal trauma.
- Published
- 2003
31. Small bowel obstruction in children due to persimmon phytobezoars
- Author
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Arshad, Zafar, Sajjad, Ahmad, Aamir, Ghafoor, and Mohsin Raza, Turabi
- Subjects
Bezoars ,Male ,Treatment Outcome ,Child, Preschool ,Intestine, Small ,Humans ,Female ,Diospyros ,Child ,Digestive System Surgical Procedures ,Intestinal Obstruction - Abstract
To present the clinical picture of small bowel obstruction caused by Persimmon phytobezoars in children of Hazara (Northern Pakistan).Descriptive case series.Three general surgical units of Ayub Teaching Hospital, Abbottabad from November 1998 to March 2003.Nineteen children were managed for small bowel obstruction due to persimmon phytobezoars. The age, gender, season at the time of presentation, history of persimmon ingestion, symptoms, signs, site of obstruction, operative procedure and outcome were analyzed.There were 15 males and 4 females with ages ranging from 4-11 years (mean 7 years). All presented in winter with a positive history of persimmon ingestion. All had signs and symptoms and evidence of small bowel obstruction on plain abdominal x-rays. At laparotomy, ileum was the commonest site of obstruction. Milking of bezoars into caecum was performed in 17 patients while 2 patients required enterotomy for removal of bezoars. Complications occurred in 4 patients. There was no mortality.Small bowel obstruction in children due to persimmon phytobezoars is uncommon. However, it should be considered pre-operatively as a possible cause of intestinal obstruction in winter in children who have access to the fruit. Laparotomy should be performed for persistent obstruction or signs of strangulation.
- Published
- 2003
32. Hand-made colostomy bag
- Author
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Ehtisham Malik and Arshad Zafar
- Subjects
medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,General surgery ,Public Health, Environmental and Occupational Health ,Colostomy ,MEDLINE ,Equipment Design ,Surgery ,Infectious Diseases ,medicine ,Cost analysis ,Equipment Reuse ,Drainage ,Humans ,Pakistan ,Disposable Equipment ,business ,Developing Countries ,Colonic disease - Published
- 2002
33. Amoebic liver abscess: a comparative study of needle aspiration versus conservative treatment
- Author
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Arshad, Zafar and Sajjad, Ahmed
- Subjects
Adult ,Male ,Adolescent ,Liver Abscess, Amebic ,Humans ,Female ,Amebicides ,Prospective Studies ,Middle Aged ,Suction ,Aged - Abstract
Amoebic liver abscess is a serious problem in Pakistan. Its management includes antimicrobial drugs, needle aspiration and surgical drainage. This study was done to see the therapeutic efficacy, safety and outcome of ultrasound guided needle aspiration of amoebic liver abscess combined with antiamoebic drugs.This was a prospective study with a minimum follow up of six months comparing the results of needle aspiration plus antiamoebic drugs with drug treatment alone in Amoebic Liver Abscess. It was carried in Surgical 'B' Unit of Ayub Teaching Hospital from July 1998 to June 2001. The patients were divided into two groups. Group A with abscess300 cm3 were treated with drugs alone. Group B patients with abscess300 cm3 or smaller abscesses which failed to respond to medical treatment were treated with both needle aspiration and drugs. Main outcome measures were abdominal pain, fever, anorexia, hepatomegaly, resolution of amoebic liver abscess on ultrasound, length of hospital stay and any complications.There were 46 patients in the study group. 21 (45.5%) patients were in Group A and 25 (54.5%) in Group B. The ages ranged from 15-70 years. 38 patients were male and 8 were females. The right lobe was involved in 44 (95.5%) patients and left lobe in 2 (4.5%) patients. Mean volume of abscess in Group A was 225 cm3 and in Group B was 560 cm3. Needle aspiration was successful in 24 (96.3%) patients and failed in 1 (3.7%) patient. The mean time of clinical improvement was 7 and 3 days respectively in Groups A and B. The mean hospital stay was shorter in Group B (3.5 day) than Group A (7.5 days). The resolution of abscess seen on ultrasound was rapid in Group B. Complications occurred in only one patient in Group B. No mortality was seen in any group.Needle aspiration combined with antiamoebic drugs is more effective than drug treatment alone in the management of amoebic liver abscess.
- Published
- 2002
34. Modified stripper for varicose vein surgery
- Author
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Arshad Zafar
- Subjects
medicine.medical_specialty ,business.industry ,Public Health, Environmental and Occupational Health ,MEDLINE ,Equipment Design ,Surgery ,Varicose vein surgery ,Varicose Veins ,Infectious Diseases ,Medicine ,Humans ,Saphenous Vein ,business ,Vascular Surgical Procedures - Published
- 2001
35. Office haemorrhoidectomy with local anaesthesia: a feasible day-case procedure
- Author
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Arshad Zafar, Johar Ali Ansari, and Sajjad Ahmad
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,Hemorrhoids ,Patient satisfaction ,Outpatients ,medicine ,Operating time ,Humans ,Ligature ,Ligation ,Postoperative Care ,Analgesics ,Urinary retention ,business.industry ,Public Health, Environmental and Occupational Health ,Urination disorder ,Length of Stay ,Ambulatory Surgical Procedure ,After discharge ,medicine.disease ,Surgery ,Treatment Outcome ,Infectious Diseases ,Ambulatory Surgical Procedures ,Patient Satisfaction ,Anesthesia ,Female ,medicine.symptom ,business ,Anesthesia, Local ,Follow-Up Studies - Abstract
We report on 100 patients (88 men and 12 women) who underwent ligation-excision haemorrhoidectomy for prolapsing haemorrhoids in an outpatient office setting under local anaesthesia. Operating time, complications during procedure, postoperative complications and patient satisfaction with the procedure were analysed. The mean operating time was 55 (40–90) minutes. Ninety-seven were discharged three to five hours after surgery. Three patients were directly admitted to the hospital after surgery. One patient was readmitted after discharge. Severe postoperative pain occurred in eight; three suffered urinary retention; 88% were satisfied with the surgery but 12% were not. This study shows that, in selected patients, performing ligation-excision haemorrhoidectomy under local anaesthesia in the outpatient office setting is safe and viable.
- Published
- 2009
36. Performance Analysis of Calcium-Doped Titania (TiO 2) as an Effective Electron Transport Layer (ETL) for Perovskite Solar Cells.
- Author
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Arshad, Zafar, Shakir, Sehar, Khoja, Asif Hussain, Javed, Ahad Hussain, Anwar, Mustafa, Rehman, Abdur, Javaid, Rahat, Qazi, Umair Yaqub, and Farrukh, Sarah
- Subjects
- *
SOLAR cells , *TITANIUM dioxide , *PEROVSKITE , *ENERGY consumption , *SOL-gel processes , *THIN films - Abstract
Ca-doped TiO2 films were synthesized by the modified sol-gel method and employed as the electron transport material of perovskite solar cells (PSCs). Morphological, optoelectronic, thermal, and electrical studies of thin films were investigated through XRD, RAMAN, SEM, AFM, UV-Vis, FTIR, and IV characteristics. Ca doping was detected with the help of structural properties while morphological analysis revealed that thin films based on Ca-doped titania are crack-free, homogenous, and uniformly distributed. Further optoelectronic properties have shown a promising conversion efficiency of 9.79% for 2% Ca-doped titania followed by 1% Ca-doped titania, while 3% have shown the lowest conversion efficiency among these prepared samples. The 2% an optimized doping of Ca has shown an almost two-fold increase in conversion efficiency in comparison to pristine TiO2, along with an increase in current density from 15 mA⋅cm−2 to 19.3 mA⋅cm−2. Improved energy efficiency and higher current density are attributed to faster electron transportation; moreover, the optimized percentage of Ca doping seems to be an effective approach to improve the PSCs' performance. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
37. Optimized Cu-doping in ZnO electro-spun nanofibers for enhanced photovoltaic performance in perovskite solar cells and photocatalytic dye degradation.
- Author
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Lee KH, Farheen R, Arshad Z, Ali M, Hassan H, Alshareef M, A Dahshan, and Khalid U
- Abstract
Perovskite solar cells (PSCs) compete with conventional solar cells regarding their low-temperature processing and suitable power conversion efficiency. In PSCs, the electron transport layer (ETL) plays a vital role in charge extraction and avoiding recombination; however, poor charge transport of ETL leads to high internal resistance and associated low fill factors. To successfully resolve this challenge, copper-doped zinc oxide nanofibers as an electron transport layer are prepared with various doping levels of 1, 2, and 3 wt% using the electrospinning sol-gel method. The 3 wt% doping of Cu revealed the optimum performance as an ETL, as it offers an electrically efficient transporting structure. SEM images revealed a randomly oriented distribution of nanofibers with different sizes having mesoporous uniformity. Optical properties of doped nanofibers examined using UV-visible analysis showed an extended light absorption due to heteroatom-doping. Adding Cu into the ZnO leads to enhanced charge mobility across the electron transport material. According to Hall measurements, dopant concentration favors the conductivity and other features essentially required for charge extraction and transport. The solar cell efficiency of ZnO doped with 0%, 1%, 2%, and 3% Cu is 4.94%, 5.97%, 6.89%, and 9.79%, respectively. The antibacterial and photocatalytic activities of the prepared doped and undoped ZnO are also investigated. The better light absorption of Cu-ZnO showed a pronounced improvement in the photocatalytic activity of textile electrodes loaded with doped ZnO. The dye degradation rate reaches 95% in 180 min under visible light. In addition, these textile electrodes showed strong antibacterial activity due to the production of reactive oxygen species under light absorption., Competing Interests: The authors declare no conflict of interest., (This journal is © The Royal Society of Chemistry.)
- Published
- 2024
- Full Text
- View/download PDF
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