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43.
F. S. Qureshi A. S. Sheikh Z. Khan M. Ahmad 《Journal of Materials Engineering and Performance》1999,8(3):347-352
In this work, a statistical evaluation of the crack-growth process in high-density polyethylene (HDPE) was carried out. The
specimens were compression molded from virgin, molding-grade HDPE. Edgenotched specimens for replicate fatigue testing were
prepared from compression-molded sheets. Fatigue test results were then analyzed, and it is shown that if the crack-growth
process can be characterized as a random process following a power-law-type behavior, then the time to reach a critical crack
length will be distributed according to an inverted lognormal model. 相似文献
44.
S.Z. Qamar A.K. Sheikh A.F.M. Arif M. Younas T. Pervez 《Journal of Materials Processing Technology》2008,202(1-3):96-106
Due to the high cost of metal forming tools (especially in hot extrusion), one of the major goals in tool design is a longer service life. Estimation and prediction of tool life thus becomes critically important for performance evaluation of the tools. The two most dominant failure mechanisms for extrusion dies (solid, hollow, and semi-hollow dies all taken together) are fracture and wear. In the first part of the paper, a fracture mechanics based fatigue life prediction model is described. A similar treatment is then presented for wear-related failures. Fracture and wear usually coexist as failure modes, and final die breakdown occurs due to the mechanism that becomes dominant. Therefore, a competing fracture–wear model has been later developed to represent the complete die failure situation. Attempt has been made to correlate the stochastic nature of various fatigue and wear related die parameters to die life. Monte Carlo simulation has been used to predict the life distribution of a die for a given set of manufacturing conditions and mechanical properties. In comparison with actual life data from the industry, the simulated life yields very realistic predictions. 相似文献
45.
This paper proposes a new structure of decision feedback equalizer that exploits the cyclostationary properties of digitally
modulated signals to mitigate interference. In the proposed structure, the forward filter of the conventional DFE is replaced
by a cyclic filter. It is assumed that the desired and the interference signals use some mutually different signaling attributes,
for example symbol rates, centre frequency etc. The resulting structure is evaluated in the presence of up to six strong interfering
signals, a scenario that is typically found in wireless cellular systems. The proposed structure provides performance gains
for some modulation formats but it reduces to the conventional DFE for other signal formats. 相似文献
46.
N. P. Bharathi Nazia Umar Khan Sheikh Shreaz Athar Adil Hashmi 《Journal of Inorganic and Organometallic Polymers and Materials》2009,19(4):558-565
Zinc containing oil based polyesteramide resins were synthesized by condensation polymerization reaction between castor/soyabean
oil derived castor/soyabean fatty amide diol (HECA/HESA), Zn (OH)2 and adipic acid. The conventional spectroscopic techniques such as FTIR, 1HNMR, 13CNMR have been used to establish the structure of the polymers. Standard laboratory methods were used to study the physicochemical
characteristics like acid value, hydroxyl value, saponification value, iodine value, specific gravity, and viscosity. The
thermal behaviour of the polymers was analyzed by using thermo gravimetric analysis (TGA) and differential scanning calorimetry
(DSC). In vitro antifungal (anticandidial) activity of the polymers was studied against C. albicans ATCC-10261, C. glabrata ATCC-90030 and C. tropicalis ATCC-750, respectively. Antibacterial activity against Gram positive (S. subtillis) and Gram negative bacteria (E. coli and S. typhi) was also examined. For more accuracy, growth curve studies were carried out with the polymer SZ showing higher biological
activity against E. coli by using conventional spectrophotometer. The result showed that the polymers have potent anticandidial and antibacterial
activities. 相似文献
47.
Ahmed Kamal B. Rajendra Prasad A. Malla Reddy M. Naseer A. Khan 《Catalysis communications》2007,8(12):1876-1880
Application of sulfamic acid as an efficient and green catalyst for the ring opening of epoxides by aliphatic and aromatic amines under solvent-free conditions is described. In this process the use of basic neutralization agent was not required due to the intrinsic zwitterionic property of sulfamic acid. The salient features of this methodology are cheaper process, easy availability of the catalyst, versatility, and the catalyst can be recovered after completion of the reaction and can be recycled without affecting the catalytic property. 相似文献
48.
Javaid Akhtar Muhammad Imran Yaqub Javed Iqbal Naseer Sheikh Tanzila Saba 《国际自然能源杂志》2018,39(8):904-908
In this review the energy potential of Pakistan from hydro, coal, wind, solar and nuclear sources has been discussed. The new projects that are being commissioned on coal, wind, solar, hydel and nuclear-based technologies have also been mentioned. The review has also explored the future prospects of the country’s energy requirements. Pakistan has potential to produce 100,000?MW of electricity from Thar coal for 20 years, 56,000?MW of hydroelectricity, 150,000?MW of wind energy and ~50,000?MW from solar sources. The coal-fired power generation is expected to 11,500?MW in period 2017–2019. The country is moving in the right direction to cater its energy needs. However, there is a need to find local and foreign investment in the country to meet high energy demands in the country in future. 相似文献
49.
The grafting of methyl methacrylate (MMA) onto ultra‐high‐molecular‐weight polyethylene (UHMWPE) and chromic acid etched UHMWPE was conducted with a preirradiation method in air in the presence of a Mohr salt and sulfuric acid. The grafted samples were characterized by Fourier transform infrared (FTIR) spectroscopy, a gravimetric method, differential scanning calorimetry, scanning electron microscopy (SEM), and interfacial bonding strength measurements. The FTIR results showed the presence of ether and carbonyl groups in the MMA‐grafted UHMWPE (MMA‐g‐UHMWPE) samples. The Taguchi experimental design method was used to find the best degree of grafting (DG) and bonding strength. The efficient levels for different variables were calculated with an analysis of variance of the results. SEM micrographs of MMA‐g‐UHMWPE samples showed that with increasing DG and chromic acid etching, the MMA‐g‐UHMWPE rich phase increased on the surface; this confirmed the high interfacial bonding strength of the grafted samples with bone cement. The grafting of the MMA units onto UHMWPE resulted in a lower crystallinity, and the crystallization process proceeded at a higher rate for the MMA‐g‐UHMWPE samples compared to the initial UHMWPE; this suggested that the MMA grafted units acted as nucleating agents for the crystallization of UHMWPE. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
50.
Muzafar A. Kanjwal Nasser A. M. Barakat Faheem A. Sheikh Myung Seob Khil Hak Yong Kim 《International Journal of Applied Ceramic Technology》2010,7(Z1):E54-E63
In the present study, we are introducing silver-doped titanium oxide nanofibers produced by electrospinning technique. Calcination of dry nanofiber mats consisting of silver nitrate–titanium isopropoxide/PVAc in air at 600°C for 1 h leads to produce Ag-doped titania nanofibers. Two dyes have been invoked to check the photocatalytic ability of the produced nanofibers; methylene blue dihydrate and methyl red. The obtained results indicated that the silver-doped titanium oxide nanofibers can eliminate >92% of the methylene blue dye within 10 min only. In a case of methyl red, almost the dye was decayed (93%) within 3 h. 相似文献