نتایج جستجو برای: insulation required indices
تعداد نتایج: 582840 فیلتر نتایج به سال:
Aerogel is a unique nanoparticle that has grown dramatically in the world of chemistry over the past few decades. Aerogel features: Very low density, ultra-porous surface, sound and heat absorber, and super hydrophobic. Depending on the type of aerogels and their synthesis methods, different applications in military industries such as: Explosives, Rocket fuels, thermal insulation, sound insulat...
in this study, the effect of wall orientation on the optimum insulation position in the wall from different perspectives is studied numerically. using crank- nicolson one dimensional transient heat conduction equation is solved for the wall with convection boundary conditions. outdoor temperature is considered as a periodic function of time. since natural night ventilation is used in the buildi...
INTRODUCTION In the prehospital care of a cold and wet person, early application of adequate insulation is of utmost importance to reduce cold stress, limit body core cooling, and prevent deterioration of the patient's condition. Most prehospital guidelines on protection against cold recommend the removal of wet clothing prior to insulation, and some also recommend the use of a waterproof vapor...
In order to preserve structure and also achieve the desired thrust rocket motor, engine Case temperature should be prevented increase excess.This operation the can be done by Insulation. EPDM rubber because of advantages such as low specific weight, improve aging properties, as long as thermal insulation for solid propellant motors case bond Introduced and its properties are investigated in thi...
polysulfide resins,with trade name of g4 and g112, with short and long chain lengths respectively, were used as reactive modifiers to toughen epoxy resin. the effects of molecular weights of g4 and g112 on impact resistance, dielectric constant, thermal conductivity as well as decomposition heat and adhesion properties of toughened epoxy were investigated. the impact strength and the dielectr...
This paper describes an accelerated ageing experiment of transformer oil/paper insulation with preset moisture levels. These samples were tested with return voltage and polarisation/depolarisation measurements. Molecular weight has also been measured with Gel Permeation Chromatography (GPC). Results suggested the impact of moisture on the ageing of oil/paper insulation. An attempt has been made...
Recycling treatment of cable insulation resin generated from electric wires and cables was investigated. Conventional insulation PVC contains a lead component, tribase, as a thermal stabilizer and lead removal is necessary to recycle this PVC as insulation resin. This paper describes a solid surface adsorption method using ion exchange resin to remove the fine lead containing particles from PVC...
A study was conducted to determine the effect of heat stress on semen criteria and testis size in Santa Inês hairy rams, in the State of Ceará, Northeast of Brazil. The scrotum of eight adult rams was insulated for seven days. Animals were evaluated twice before insulation and, after insulation, at 12 different periods until 118 days. Scrotal insulation did not affect semen volume, but pH was i...
OBJECTIVES We carried out an evaluation of a large-scale New Zealand retrofit programme using administrative data that provided the statistical power to assess the effect of insulation and/or heating retrofits on cardiovascular and respiratory-related mortality in people aged 65 and over with prior respiratory or circulatory hospitalisations. DESIGN Quasi-experimental cohort study based on ad...
a total of twenty local and foreign maize (zea mays l.) hybrids in five different maturity group were studied in mashhad for two years (2007-2008). temperature variations were created by two planting dates (5 may and 20 may). results indicated that both indices, gdd and chu, estimated heat units of different maturity hybrids and based on, created similar groups of hybrids. both indices showed s...
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