نتایج جستجو برای: initial and constant
تعداد نتایج: 16868391 فیلتر نتایج به سال:
The aim of this study is to investigate the influence of fiber stacking sequence on the penetration and perforation of glass/epoxy composite hat shapes under high velocity impact loading by projectile with semi-spherical nose shape with three different initial velocities using numerical and experimental methods. Four layered unidirectional (UD) E-glass fiber/polyester resin was used to construc...
Background and purpose: Sonocatalytic process as an advanced oxidation process is considered for degradation of pollutants in aqueous solution. The aim of this study was to increase the removal of dye by doping of TiO2 with non-metal element such as nitrogen. Materials and methods: Un-doped and N-doped TiO2 nano-particles with different nitrogen contents were synthesized by a simple sol–gel me...
An experiment investigating the elastic local buckling response of trough girders composed of thin profiled steel sheeting has been undertaken Beam tests were performed to promote initial local buckling in a region of constant moment in the elastic range of structural response. The results of the experiments were compared with an elastic complex semi-analytical finite strip method of analysis, ...
in this thesis a calibration transfer method is used to achieve bilinearity for augmented first order kinetic data. first, the proposed method is investigated using simulated data and next the concept is applied to experimental data. the experimental data consists of spectroscopic monitoring of the first order degradation reaction of carbaryl. this component is used for control of pests in frui...
background: the present study aimed to translate and evaluate the reliability and validity of the persian version of the 11-item intermittent and constant osteoarthritis pain (icoap) measure in iranian subjects with knee osteoarthritis (koa). materials and methods: the icoap questionnaire was translated according to the manufacturers alliance for productivity and innovation (mapi) protocol. the...
In this study, nanoscale zero-valent copper (nZVC) as catalyst activated persulfate (PS) was used for the degradation of p-chlorophenol (p-CP) under ultrasonic (US) irradiation in aqueous solution. The effect of different operational parameters such as solution pH (3.5-10.5), PS concentration (1-7.5 mm/L), nZVC dosage (5-35 mg/L) and initial p-CP concentration (10-100 mg/L) were evaluated at di...
Background and purpose: Phenol is one of prevalent contaminants found in many industrial wastewaters. The combination with special features, such as high toxicity, carcinogenic properties, vitality gathering ability, low biodegradation potentiality and others, based on the U.S Environmental Protection Agency, classified as a priority pollutant. The purpose of this study was to determine the eff...
in this study, friction stir spot welding (fssw) is applied to join the tial6v4 titanium alloy with 1.5 mm thickness and then the effect of rotational speed and tool dwell time on microstructure and mechanical properties is investigated. in this regard, the speed of the tool rotation was considered as 800, 1000, and 1200 rpm, as well as the tool dwell time was set at 7 and 12s. microstructural ...
Short Distance Physics and Initial State Effects on the CMB Power Spectrum and Cosmological Constant
We investigate a modification in the action of inflaton due to noncommutativity leads to a nonstandard initial vacuum and oscillatory corrections in the initial power spectrum. We show that the presence of these oscillations causes a drop in the WMAP χ2 about ∆χ2 ∼ 8.5. We also show that this nonstandard initial vacuum state can provide a rolling in cosmological constant. As a bonus, from the p...
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