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( Ali Toor Umair ),( Min Wook Kim ),( Dong Jin Kim ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.5
Nitrification in wastewater treatment emits a significant amount of nitrous oxide (N2O), which is one of the major greenhouse gases. However, the actual mechanism or metabolic pathway is still largely unknown. Selective nitrification inhibitors were used to determine the nitrification steps responsible for N2O emission with activated sludge and enriched nitrifiers. Allylthiourea (86 μM) completely inhibited ammonia oxidation and N2O emission both in activated sludge and enriched nitrifiers. Sodium azide (24 μM) selectively inhibited nitrite oxidation and it led to more N2O emission than the control experiment both in activated sludge and enriched nitrifiers. The inhibition tests showed that N2O emission was mainly related to the activity of ammonia oxidizers in aerobic condition, and the inhibition of ammonia monooxygenase completely blocked N2O emission. On the other hand, N2O emission increased significantly as the nitrogen flux from nitrite to nitrate was blocked by the selective inhibition of nitrite oxidation.
Umair Ali Toor,신현아,김동진 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
Efficiency of phosphorus recovery from polyaluminum chloride sludge is determined by chemicalinteractions between Al and P. Chemical structure of Al–P complex and their binding mechanisms in thePAC sludge were investigated with spectroscopy and chemical fractionation. More than 98% of the P wasbound with Al, out of which 70% was strongly bound. The ATR-FTIR analysis indicates that the majority ofthe P formed inner sphere complex with Al through ligand exchange. The availability of highly protonatedsurface for P sorption at low pH also supports the formation of Al–P outer sphere complex.
Acute Gastrointestinal Bleeding in COVID-19 Patients: A Systematic Review and Meta-Analysis
Umair Iqbal,Hafsa Anwar,Hafiz Umair Siddiqui,Muhammad Ali Khan,Faisal Kamal,Bradley D. Confer,Harshit S. Khara 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4
Background/Aims: More than 100 million people to date have been affected by the coronavirus disease-2019 (COVID-19)pandemic. Patients with COVID-19 have a higher risk of bleeding complications. We performed a systematic review and metaanalysisto evaluate the outcomes of COVID-19 patients with signs and symptoms of acute gastrointestinal bleeding (GIB). Methods: A systematic literature search was carried out for articles published until until November 11, 2020, in the Embase,MEDLINE, Web of Science, and Cochrane Library databases. We included studies on COVID-19 patients with signs and symptomsof GIB. Results: Our search yielded 49 studies, of which eight with a collective 127 patients (86 males and 41 females) met our inclusioncriteria. Conservative management alone was performed in 59% of the patients, endoscopic evaluation in 31.5%, and interventionalradiology (IR) embolization in 11%. Peptic ulcer disease was the most common endoscopic finding, diagnosed in 47.5% of thepatients. Pooled overall mortality was 19.1% (95% confidence interval [CI]; 12.7%-27.6%) and pooled mortality secondary to GIBwas 3.5% (95% CI; 1.3%–9.1%). The pooled risk of rebleeding was 11.3% (95% CI; 6.8%–18.4%). Conclusions: The majority of COVID-19 patients with GIB responded to conservative management, with a low mortalityrate associated with GIB and the risk of rebleeding. Thus, we suggest limiting endoscopic and IR interventions to those withhemodynamic instability and those for whom conservative management was unsuccessful.
N<sub>2</sub>O emission during wastewater nitrification with enriched nitrifying bacteria
Toor, Umair Ali,Han, Dong-Woo,Kim, Dong-Jin Informa UK (Taylor Francis) 2016 Desalination and water treatment Vol.57 No.2
<P>Nitrifying bacteria were enriched in a sequencing batch reactor and used to quantify N2O emission specifically by wastewater nitrification while minimizing or preventing the chances of denitrification during the experiment. Batch wastewater nitrification was carried out in a reactor (working volume 0.5L) at different aeration rates (10 and 20mL/min) and -N concentrations (25, 50, and 100mg/L). Wastewater nitrification efficiencies were more than 97% in all the cases except at 100mg/L with 10mL/min aeration rate (92%). Cumulative N2O emission reached 0.2, 1.15, and 2.67mg (aeration: 10mL/min) and 0.37, 2.18, and 3.08mg (aeration: 20mL/min) at the initial -N concentration of 25, 50, and 100mg/L, respectively. N2O emission yields (kg N2O-N per kg processed -N) were 0.016-0.058 and 0.029-0.088 at 10 and 20mL/min aeration rate, respectively. The yields were higher than that of denitrification. The results showed that cumulative N2O emission and the yield increased at higher ammonium concentration and aeration rate. Accumulated nitrite during nitrification also contributed and played a pivotal role in N2O emission.</P>
Toor, Umair Ali,Shin, Hyuna,Kim, Dong-Jin Elsevier 2019 Journal of industrial and engineering chemistry Vol.71 No.-
<P><B>Abstract</B></P> <P>Efficiency of phosphorus recovery from polyaluminum chloride sludge is determined by chemical interactions between Al and P. Chemical structure of Al–P complex and their binding mechanisms in the PAC sludge were investigated with spectroscopy and chemical fractionation. More than 98% of the P was bound with Al, out of which 70% was strongly bound. The ATR-FTIR analysis indicates that the majority of the P formed inner sphere complex with Al through ligand exchange. The availability of highly protonated surface for P sorption at low pH also supports the formation of Al–P outer sphere complex.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PAC sludge contained AlPO<SUB>4</SUB> or related Al–phosphate complex. </LI> <LI> Results showed that 2 types of Al–P bonds are formed in PAC sludge. </LI> <LI> 70% of total Al–P, strongly bound, while 29% was moderate to strongly bound. </LI> <LI> Al–P complex are formed majorly by ISC through ligand exchange mechanism. </LI> <LI> Bidentate binuclear complex followed by monodentate mononuclear and bidentate mononuclear formed at acidic and alkaline pH respectively. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Toor Umair Ali,Zubair Ahmed,김동진 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Empirical N2O emission correlations were developed from wastewater nitrification in a controlled laboratory scale batch reactor. The results showed that higher concentrations of ammonium and nitrite emitted more N2O. The N2O-N yields were 0.092–0.124 (synthetic wastewater) and 0.124–0.152 kg N2ON/kg consumed NH4+-N (municipal wastewater). Regression analysis showed that N2O emission had positive linear correlation with logarithm of NH4+-N concentration and exponential of NO2 -N concentration. The results indicate that nitrite is the most influential component on N2O emission in wastewater nitrification. The models can be used to estimate and to mitigate N2O emission from wastewater treatment plant.
Syed Ahmad Ali,Umair Ali 대한공간정보학회 2017 Spatial Information Research Vol.25 No.6
Kashmir basin situated in tectonically active area NW Himalaya is surrounded by a number of seismogenic faults. In the present study, the structures are identified using the edge enhancement filters, false colour composite and DEM derived products like shaded relief, aspect, slope, drainage network, and 3D profiling. Linear structural feature map was analysed using density, orientation, length, and subsequently correlated with geological map. The area shows highest density in NW–SE, E–W and N–S orientation, with predominance of first direction structures with trend resemblance to tectonic structures present in and around. The western flank shows high density of tectonic lineaments, the Gulmarg and Tosamaidan lineament are supported by geomorphic evidences and shows linear trend with the tectonic structures including Balapur fault (out-of-sequence fault) mapped in Pleistocene deposits and earthquake epicentres present in and around the area. These results correspond to the overall NW–SE direction of the structures resulting from the NE– SW compressional effect of the regional tectonic structures. The approach applied for extraction of structural features of tectonic origin will prove to be very crucial for further investigation in future for fault delineation, seismic and landslide hazard assessment, and mitigation measures in the region.
A Review of Structural Testing Methods for ASIC based AI Accelerators
Umair, Saeed,Irfan Ali, Tunio,Majid, Hussain,Fayaz Ahmed, Memon,Ayaz Ahmed, Hoshu,Ghulam, Hussain International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.1
Implementing conventional DFT solution for arrays of DNN accelerators having large number of processing elements (PEs), without considering architectural characteristics of PEs may incur overwhelming test overheads. Recent DFT based techniques have utilized the homogeneity and dataflow of arrays at PE-level and Core-level for obtaining reduction in; test pattern volume, test time, test power and ATPG runtime. This paper reviews these contemporary test solutions for ASIC based DNN accelerators. Mainly, the proposed test architectures, pattern application method with their objectives are reviewed. It is observed that exploitation of architectural characteristic such as homogeneity and dataflow of PEs/ arrays results in reduced test overheads.