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Atiq, Shahid,Hussain, Asif,Kwon, Byung-il The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.1
This paper presents a novel concept of phase swapping to associate multiple flux weakening ranges to a non-salient PM machine without altering any hardware of the machine. The proposed concept enables a dual three-phase machine to be operated with different displacement angles between the two three-phase windings. Hence, different flux weakening ranges using winding switching can be accomplished by applying this concept. It was also demonstrated that the proposed concept can be utilized for the discrete step as well as continuous operation of the machines. Any application requiring a wide speed range operation of up to thirteen times the base speed can benefit from this proposed concept. Analytical, simulation, and experimental results are provided to validate the effectiveness of the proposed concept.
Atiq, Shahid,Lipo, Thomas A.,Kwon, Byung-il IET 2016 IET electric power applications Vol.10 No.4
<P>Flux weakening is an inevitable requirement in the operation of variable speed permanent magnet (PM) machines for high-speed applications due to inverter voltage limits. A new winding switching technique is experimentally validated in this study that can extend the speed range of such PM machines. A drive topology is proposed that utilises two current regulated voltage source inverters to control the machine in a dual inverter fed configuration before transitioning into an open winding configuration after winding switching. The proposed drive topology extends the constant torque region of the machine and boosts its maximum output power capability. Complete experimental results are provided to demonstrate the effectiveness of the proposed machine drive system for continuous operation over the entire speed range.</P>
Atiq Ur Rehman,Chunyi Guo,Chengyong Zhao,Wen Jiang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
This paper compares the performance of diff erent dynamic reactive power compensators (DRPCs) on transient characteristics of LCC based UHVDC system under hierarchical connection mode (LCC-UHVDC-HCM). The diff erent DRPCs considered are Synchronous Condenser (SC), STATCOM and combination of both SC and STATCOM (hybrid dynamic reactive power compensator, HDRPC). Various transient indices like commutation failure immunity index (CFII), commutation failure probability index (CFPI) and fault recovery time (FRT) of LCC-UHVDC-HCM system are undertaken in order to evaluate the comparative performance of various DRPCs. The LCC-UHVDC-HCM system along with diff erent DRPCs is developed in PSCAD/EMTDC and numerous simulations are done to observe the transient phenomena. The results indicate that performance of DRPCs changes during various AC disturbances such as single phase to ground fault and three phase to ground fault for diff erent fault severity. It is examined that STATCOM is better than other dynamic compensators in improving CFII and CFPI. SC and HDRPC show almost same behavior in improving CFII. However, in case of CFPI, HDRPC is superior to SC. The performance of SC is better than STATCOM and HDRPC in improving FRT under severe fault conditions. However, under low fault conditions, all DRPCs have equal performance in reducing FRT.
Atiq, Ayesha,Shal, Bushra,Naveed, Muhammad,Khan, Adnan,Ali, Jawad,Zeeshan, Sara,Al-Sharari, Shakir D.,Kim, Yeong Shik,Khan, Salman Elsevier 2019 european journal of pharmacology Vol.843 No.-
<P><B>Abstract</B></P> <P>5-Fluorouracil (5-FU) is one of the most commonly prescribed anti-cancer agent. However, its use is associated with several debilitating adverse effects such as intestinal mucositis (IM) and myelosuppression. Oxidative stress and inflammation are major contributors in the development of mucositis. Diadzein is known for its potent anti-inflammatory and anti-oxidative activities from decades. The present study focused on investigating the effects of diadzein on intestinal mucositis induced by 5-FU by mainly focusing on oxidative stress and inflammatory markers in mice. Mucositis was induced in mice by administration of 5-FU (50 mg/kg, i.p.), once daily for three days and diadzein (1, 5, 10 mg/kg) was administered once daily for seven days. Diadzein pretreatment was found to reduce the severity of mucosal injury in a dose-dependent manner. Diadzein significantly reversed weight loss, relieved diarrhea, and improved histopathological deformities associated with inflammation. Moreover, diadzein remarkably improved the intestinal wall histopathology by reducing inflammatory mediators infiltration and prevented suppression of antioxidants (glutathione, glutathione sulfo-transferase, and catalase) by 5-FU administration. Furthermore, nitrite production in intestinal tissue was reduced by diadzein consistent with the observed modulation of inflammatory markers. Additionally, diadzein also improved the amended microflora profile, by reducing the number of pathogenic bacteria and increasing the abundance of probiotics. Taken together, the behavioral, biochemical and histological outcomes of the present study demonstrates that diadzein has significant anti-mucositis properties in 5-FU induced mucositis model, and the attenuative potential of diadzein might be due to inhibition of oxidative stress and inflammatory mediators.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Rehman, Atiq-ur,Thompson, E.F.,Rafique, S. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.6
Fifteen sheep were used in a trial which compared the feeding value of whole barley gain and cottonseed cake as supplements to a basal diet of leaves of fourwing saltbush (Atriplex canescens). Diet SB contained 700 g (air-dry matter) of saltbush alone, diet SB + BG contained 700 g SB with 400 g whole barley grain and diet SB + CS contained 700 g SB with 400 g cottonseed cake. The digestibility of the dry matter of diets SB (69%) and SB + CS (70%) were lower (p < 0.001) than of diet SB + BG (76%). Sheep offered SB alone daily lost 80g whereas those fed the other diets gained 11 g (SB + CS) or 17 g (SB + BG) per day. Daily water consumption of the sheep offered the three diets was similar (p > 0.05), but their water consumption was higher (p < 0.001) than that of sheep offered daily 700 g wheat straw and 200 g barley grain. The results indicate that, at the levels of feeding used, barley grain and cottonseed cake had similar value as supplements to fourwing saltbush harvested in summer. The addition of the supplement allowed the sheep to gain some live weight. However, the presence of saltbush leaves in the diet resulted in higher water intakes by the sheep.
Rehman, Atiq-ur,Rafique, Shahid,Ali, Amanat,Munir, M. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.4
Twenty-four Harnai lambs 6 to 7 month old, weighing $16{\pm}2kg$ were used in a completely randomized design in growth and digestibility trials to study fourwing saltbush ratio supplemented with cotton seed cake. The animal were divided at random into three groups of 8 animals each. Three iso-nitrogenous (10.5% CP) experimental rations (1, 2 and 3) containing wheat straw + lucerne hay (24:76); fourwing saltbush (Atriplex canescens) + cotton seed cake (71:29); and wheat straw + cottonseed cake (41:59); respectively, were allotted to each group randomly. All the animals were taken out for grazing in a dormant native range for about 3 hours in the afternoon during the growth trial. The growth trial lasted for 8 weeks followed by a digestibility trial. At the end of 8 weeks lambs on ration 3 had gained significantly (p<0.10) more weight compared to those on rations 1 and 2 which maintained their body weight. The crude protein digestibility of the fourwing saltbush based ration was comparable with the other two treatments (71 vs 70 and 71%). However, the digestibility of dry matter (41%), acid detergent fibre (13%) and neutral detergent fibre (22%) of this ration was significantly lower (p<0.10) than the other two diets. The results suggest that lambs can be maintained on fourwing saltbush during winter without significant loss in body weight with 30% extra protein concentrate supplementation.