Relaxation and breakdown studies in high-temperature dielectrics.

Aromatic polyamide (aramid) paper, fluoropolymer (TEFZEL(TM)), polytetrafluoroethylene (PTFE), MYLAR(TM) polyester and polyimide (KAPTON(TM)) films, offer high inherent dielectric strength, mechanical toughness, flexibility, resilience and thus have wide application in electrical equipments. Aromatic polyamide also known as NOMEX(TM) type 410 is widely used for insulation in electric motors and transformers. TEFZEL(TM) resins are widely used to make compact wire and cable construction that provide long and reliable service in demanding environment [1][2]. KAPTON(TM) is an important material in wire and cable insulation. Rotating apparatus, transformers, capacitors, magnetic strips, pressure-sensitive tapes all can benefit by its use, since it maintain its properties over a wide range of temperature and frequency. PTFE is widely used in military applications and has found applications in industries such as fire alarm, cables, capacitor dielectrics, motor coil, phase and ground insulation, and substrate for flexiible printed circuits. MYLAR(TM) has wide applications in semiconductor manufacturing, electrical power and electronics equipments, and automotive industry. It is commonly used as wire or circuit board insulation, flexible circuits, membrane switches, and coil winding insulation. (Abstract shortened by UMI.)Dept. of Electrical and Computer Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2001 .S24. Source: Masters Abstracts International, Volume: 40-06, page: 1594. Adviser: G. R. G. Raju. Thesis (M.A.Sc.)--University of Windsor (Canada), 2002

A Study on Insulation Problems in Drive Fed Medium Voltage Induction Motors

The PWM (pulse-width-modulated) type voltage source converters (VSC) allow a precise speed control of induction motors with maximum achievable energy efficiency. However, the rapid growth of this technology has created quite a concern, as the PWM waveform produces complex transients that stress the motor insulation, to much severe levels, compared to the normal sinusoidal voltage waveforms. As a result, the machine may fail prematurely due to increased dielectric heating; high turn-to-turn stress caused by non-linear potential distributions; increased partial discharge (PD) activities due to overshoots in pulse waveforms; and built-up space charge by high frequency signals. The present work therefore addresses the problems associated with enamelled wires and groundwall insulation in motor stator coil working under PWM-VSC

Bart’s Syndrome Associated Corpus Callosum Agenesis and Choanal Atresia

How to Cite This Article: Saeed M, Haq A, Qadir Kh.Bart’s Syndrome Associated Corpus Callosum Agenesis and Choanal Atresia. Iran J Child Neurol. 2014 Autumn;8(4): 76-79.AbstractObjectiveBart’s syndrome is defined as congenital localized absence of skin, and associated with epidermolysis bullosa. A newborn with Bart’s syndrome is reported because it is a very rare condition, especially when associated with corpus callosum agenesis and concomitant choanal atresia. Clinically it is characterized by raw beefy areas of denuded skin mainly on hands and feet.We report a rare case of a term female newborn born to non-consanguineous parents who presented with congenital absence of skin in, face, trunk and extremities. To the best of our knowledge, this is the first report presenting a case of Bart’s syndrome associated with corpus callosum agenesis.ReferencesBart BJ, Garlin RJ, Anderson VE, Lynch FW. Congenital localized absence of skin and associated abnormalities resembling epidermolysis bullosa. A new syndrome. Arch Dermatol 1966; 93: 296-304.Bart BJ. Epidermolysis bullosa and congenital localized absence of skin. Arch Dermatol 1970; 101: 78-81.Skoven I, Drzewiecki KT. Congenital localized skin defect and epidermolysis bullosa hereditaria letalis. Acta Derm Venereol 1979; 59: 533-537.Wojnarowska FT, Eady RA, Wells RS. Dystrophic epidermolysis bullosa presenting with congenital localized absence of skin: report of four cases. Br J Dermatol 1983; 108: 477-483.Kanzler MH, Smoller B, Woodley DT. Congenital localized absence of the skin as a manifestation of epidermolysis bullosa. Arch Dermatol 1992; 128:1087-90.Maman E, Maor E, Kachko L, Carmi R. Epidermolysis bullosa, pyloric atresia, aplasia cutis congenita: histopathological delineation of an autosomal recessive disease. Am J Med Genet 1998; 78: 127-133.McCarthy MA, Clarke T, Powell FC. Epidermolysis bullosa and aplasia cutis. Int J Derm 1991; 30: 481-484.Puvabanditsin S, Garrow E, Daeun K. Junctional epidermolysis bullosa associated with congenital localized absence of skin. J AM Acad Dermatol 2001; 44: 330-335.Joensen HD. Epidermolysis bullosa dystrophica dominans in two families in the Faroe Islands. Acta Derm Venereol 1973; 53: 53-60.Skoven I, Drzewiecki KT. Congenital localized skin defect and epidermolysis bullosa hereditaria letalis. Acta Derm Venereol 1979; 59: 533-7.Birnbaum RY, Landau D, Elbedour K, Ofir R, Birk OS, Carmi R. Deletion of the first pair of fibronectin type III repeats of the integrin beta-4 gene is associated with epidermolysis bullosa, pyloric atresia and aplasia cutis congenita in the original Carmi syndrome patients. Am J Med Genet 2008; 146A: 1063-1066.Rajpal A, Mishra R, Hajirnis K, Shah M, Nagpur N. Bart’s syndrome. Indian J Dermatol 2008; 53: 88-90.Zelickson B, Matsumara K, Kist D, Epstein EH, Jr, Bart BJ: Bart’s syndrome. Ultrastructure and genetic linkage. Arch Dermatol 1995;131:663–668.Christinano AM, Bart BJ, Epstein EH Jr, Uitto J: Genetic basis of Bart’s syndrome: A glycine substitution mutation in the type VII collagen gene. Invest Dermatol 1996;106: 1340–1342.

Catalytic Degradation of Organic Dyes in Aqueous Medium

Water pollution by the textile industry is an emerging issue. Textile industry is the major industrial sector which contributes to water pollution. Textile industry releases a huge amount of unfixed dyes in wastewater effluents. About 20% of the dye production all over the world is discharged as waste in industrial effluents by textile industry. These dyes are highly stable and colored substances which disturb the aqueous ecosystem significantly. Therefore, there is a need for methods to remove organic dyes from textile industrial effluents. Photo catalysis and catalytic wet oxidation are best practices for degradation of dyes in wastewater. In photo catalysis, the dye molecules can be completely degraded into inorganic non-toxic compounds by irradiation of the dye solution under visible or ultraviolet light in the presence of semiconductor metal-oxide photo catalysts. In catalytic wet oxidation, various metal-based catalysts in supported or unsupported form can be used as heterogeneous catalysts for degradation of dyes in the presence of oxygen or hydrogen peroxide. These processes have several preferences like easy separation of the catalyst from reaction mixture and recycling of the catalyst

The Odd Inverse Rayleigh Family of Distributions: Simulation & Application to Real Data

A new family of inverse probability distributions named inverse Rayleigh family is introduced to generate many continuous distributions. The shapes of probability density and hazard rate functions are investigated. Some Statistical measures of the new generator including moments, quantile and generating functions, entropy measures and order statistics are derived. The Estimation of the model parameters is performed by the maximum likelihood estimation method. Furthermore, a simulation study is used to estimate the parameters of one of the members of the new family. The data application shows that the new family models can be useful to provide better fits than other lifetime models