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RISS 인기검색어
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- 저자 : Nasir Shahzad (검색결과 5 건)
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DFT Study on the Interaction of Subnanometer Cobalt Clusters with Pristine/Defective Graphene
Nasir Shahzad,Jun Ren,김찬경 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.5
The cobalt nanoparticles deposited on graphene are new interesting catalytic systems for Fischer?Tropsch synthesis (FTS) to obtain clean fuel hydrocarbons. Especially, graphene doped with Co nanoparticles could be a nice alternative material for catalysis in CO?+?H2 reaction. On the basis of first-principles calculation, we have analyzed the binding of Co n clusters (n?=?1~7) with pristine (PGr) and defective graphene (DGr). Our analysis shows that the electronic structure of the graphene-supported Co subnano-clusters plays a significant role in the catalytic activity owing to metal-support interactions, and the interaction between the Co n clusters and the graphene is local. Our results also show that the bigger the size of Co n clusters is, the smaller the interaction between the cluster and the support is, and the lower its structural distortion is. In addition, the nucleation of Co n clusters on PGr is thermodynamically favorable, but the opposite trend is obtained for DGr. Both the pristine and defective surfaces facilitate agglomeration of Co6 cluster, implying that the graphene support remarkably promotes and even prevents the sintering process of the small Co clusters. The Bader charge analysis shows that both the cobalt and graphene support are responsible for the charge densities of Co clusters.
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Liaqat Ali,Muhammad Shahzad,Nasir Orakzai,Ihsanullah Khan,Mubashira Ahmad 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.9
Purpose: To determine the efficacy of mitomycin C in reducing the recurrence of anterior urethral stricture after internal optical urethrotomy (IOU). Materials and Methods: This was a randomized controlled trial conducted in the Department of Urology at the Institute of Kidney Diseases Peshawar from March 2011 to December 2013. A total of 151 patients who completed the study were divided into two groups by the lottery method. Group A (cases) comprised 78 patients in whom mitomycin C 0.1% was injected submucosally in the stricture after conventional IOU. Group B (controls) comprised 73 patients in whom IOU only was performed. Self-clean intermittent catheterization was not offered in either group. All patients were regularly followed up for 18 months. Recurrence was diagnosed by use of retrograde urethrogram in all patients and flexible urethroscopy in selected cases. Data were collected on a structured pro forma sheet and were analyzed by SPSS. Results: The mean age of the patients in group A was 37.31±10.1 years and that in group B was 40.1±11.4 years. Recurrence of urethral stricture was recorded in 11 patients (14.1%) in group A and in 27 patients (36.9%) in group B (p=0.002). The mitomycin group also showed a delay in recurrence compared with the control group (p=0.002). Conclusions: Recurrence of urethral stricture is high after optical urethrotomy. Mitomycin C was found to be highly effective in preventing the recurrence of urethral stricture after IOU.
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Survival after extended resections for gallbladder cancer
Abu Bakar Hafeez Bhatti,Faisal Saud Dar,Shahzad Riyaz,Nusrat Yar Khan,Najla Rahman Qureshi,Nasir Ayub Khan 한국간담췌외과학회 2023 Annals of hepato-biliary-pancreatic surgery Vol.27 No.1
Backgrounds/Aims: Locally advanced gallbladder cancer (GBC) is associated with survival limited to a few months. Extended resections (ER) are occasionally performed in this group and outcomes remain inconclusive. This study assessed outcomes after ER for locally advanced GBC. Methods: Patients who underwent ER for GBC between 2011 and 2020 were reviewed. ER was defined as a major hepatectomy alone (n = 9), a pancreaticoduodenectomy (PD) with or without minor hepatectomy (n = 3), a major hepatectomy with PD (HPD) (n = 3) or vascular resection and reconstruction (n = 4). We assessed 30-day morbidity, mortality, and 2-year overall survival (OS). Results: Among 19 patients, negative margins were achieved in 14 (73.6%). The 30-day mortality was 1/9 (11.1%) for a major hepatectomy, 0/3 (0%) for a minor HPD, 2/3 (66.7%) for a major HPD, and 1/4 (25.0%) for vascular resection. All short term survivors (< 6 months) (n=8) had preoperative jaundice and 6/8 (75.0%) underwent a major HPD or vascular resection. There were five (26.3%) long term survivors. The median OS in patients with and without preoperative jaundice was 4.1 months (0.7–11.1 months) and 13.7 months (12–30.4 months), respectively (p = 0.009) (2-year OS = 7% vs. 75%; p = 0.008). The median OS in patients who underwent a major hepatectomy alone or a minor HPD was 11.3 months (6.8–17.3 months) versus 1.4 months (0.3–4.1 months) (p = 0.02) in patients who underwent major HPD or vascular resection (2 year OS = 33% vs. not reached) (p = 0.010) respectively. Conclusions: In selected patients with GBC, when ER is limited to a major hepatectomy alone, or a minor HPD, acceptable survival can be achieved.
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Aisha Abdullah,Ashfaq Ahmed,Parveen Akhter,Abdul Razzaq,Muhammad Zafar,Murid Hussain,Nasir Shahzad,Khaliq Majeed,Shahzad Khurrum,Muhammad Saifullah Abu Bakar,박영권 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
We evaluated the thermochemical properties and suitability of a variety of lignocellulosic biomass residues in Pakistan for energy production. Proximate, ultimate and calorific value analyses were performed to know the energy perspective, whereas thermogravimetric analysis was used to study the decomposition behavior of biomass samples under pyrolysis conditions. The moisture content, volatile matter, fixed carbon and ash content in the biomass samples were found within the range of 4.38-5.69%, 63.25-80.53%, 7.97-23.13%, and 7.12-14.35%, respectively. The range of carbon, hydrogen, and oxygen content was reported as 35.83-47.23%, 5.2-6.56%, and 45.6-58.55%, respectively. Lower values of sulfur and nitrogen content amongst the samples indicated that the biomass was environmentally friendly in terms of energy production. The heating value of the biomass was reported in the range of 15.20-18.44 MJ/kg. Fourier transform infrared spectroscopy showed the existence of hydroxyl, aldehydes, ketones, aromatic compounds, carbonyl compounds, ether, and halogen groups. Orange leaf biomass indicated a greater potential in producing bio-oil, whereas the horticulture biomass and mango leaves may have greater potential for biochar
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