In the development of industry and architecture of existing buildings now days and the comfort of the user's demands, especially with regard to the noise and noise prosecute, the architect has to find out the user’s needs to use sound dampening material. One of the efforts to reduce noise, especially in the room, is by installing sound absorbing material (acoustic panel) such as carpeting, foam, pumice panels, and so on. The architecture in designing buildings, often receives requests to address the noise as in residential buildings, education, recreation, trade, hotels, and industries. They desperately need the appropriate types of material and the types of construction for acoustic material. One of the materials that can be used as damping material is pumice. Pumice takes a large part of Lombok in West Nusa Tenggara.
Hassan ?organic? Analysis Using Atomic Absorption Spectrometry
As a full industrial reference, the book provides essential information for the application of absorption chiller in a tropical setting. It has everything from the development of absorption cycle model, to its characteristic performance, to exergetic analysis, to development of a set of cost model necessary for optimal operation of the system as an integrated part-load. The absorption process consists of working fluids that are circulated in close cycle at steady state and four basic process flow conditions are necessary, namely: · Adiabatic mixing of binary mixture · Mixing of two streams with heat exchange, throttling · Simple heating and · Cooling processes. The operations of absorption systems impact positively on the society. They are helpful to the society in the following perspectives: · Attainment of food security through preservation of produce · Improvement of industrial productivity due to ensured comfort · Providing friendly environment through reduced emissions · Constitute productive uses of energy according to Millennium Development Goals, MDGs aspirations. These are vital recipe for sustainable development, particularly in remote rural tropics.
Purpose of ongoing book is providing a tool for suitable modeling, increase efficiency and decrease construction cost of solar absorption chiller. At first, the solar absorption chiller is modeled by the thermodynamic laws. Then, this model is converted to the new standard mathematical programming model using exergy and thermodynamic analysis with considering all technical and economic constrains. This mathematical model is optimized by Genetic algorithm (GA). Because of the nonlinear objective function and the constraint, GA is used as optimization algorithm. After applying GA, optimized parameters of cycle heat exchanger designing and its electricity consumption are calculated. These parameters consist of heat exchanger effectiveness, heat transfer cross section area, heat transfer coefficient, efficiency of pump and motor. Designing a storage system is necessary for supporting system when sunshine is not received adequately, especially at night. Therefore, in the second a rectangular storage system with Phase Change Material (PCM) technique designs that its main parameters were calculated by enthalpy and finite element methods.
This book starts with the theoretical back ground of optical absorption in semiconductors. Various optical parameters like the absorption (A), transmission(T), extinction coefficient (K), refractive index (n),optical energy gap (Eg), etc. were calculated with detailed analysis of UV-VIS-IR spectra for ZnTe thin films deposited by successive ionic layer absorption and reaction (SILAR) method at various thickness and annealing temperature.The results are analyzed and discussed in detail in this book.
An investigation on correction and path analysis in redgram was carried to elicit the information on nature and extent of the genetic variability, heritability, genetic advance, character association and path analysis. Observations were recorded on thirteen characters. The analysis of variance indicated significant difference among the genotypes for all the 13 characters studied. The genotypic coefficient of variation for all the characters studied were lesser than the phenotypic coefficient of variation indicating masking effects of the environment. Character association studies and Path coefficient analysis revealed significant and positive correlation of seed yield per plant with number of secondary branches per plant, number of pods per plant, dry matter content per plant and harvest index and simultaneous improvement of these characters along with seed yield is possible.
Bregman: Auditory Scene Analysis: The Perceptual Organization Of Sound (cloth)
This work represents an investigation of the roles of specular and diffuse reflections in urban noise propagation with a view towards developing a simple predictive technique for long distance propagation. It is established that models based only on specular reflection and surface absorption are not sufficiently accurate to explain measured data as scattering of sound by building facades is significant. A computer model of sound propagation in a simple street was developed to take account of the probabilities associated with the branching nature of the reflection history. A simplified theory was developed incorporating an effective diffusion coefficient which increases with the order of reflection to take account of all the mixed specular-diffuse interactions. Two experimental techniques have been developed for measuring the diffusion coefficient of street facades and applied to a scale model experiment. The results obtained for values of diffusion coefficient showed the expected trend with increasing the facade irregularities.
In the present study, the numerical study is carried out for boundary layer flow over 3D aerofoil section and the aerodynamic performance of NACA aerofoil are analyzed by studying the lift and drag coefficient of the aerofoil.The results obtained in the case of boundary layer flow over the 3D aerofoil section are compared with the experimental data as available in the literature. The experimental data for NACA 64-009 from wind tunnel is validated with simulations results computed in FLUENT. The aerofoil is cambered and measured to be around 1mt. The simulations for boundary layer flow for NACA 64-009 is performed at various angles of attacks. In addition, the lift coefficient, drag coefficient, pressure contour and velocity contour are computed.
Naproxen and ibuprofen (aryl propionic acid derivatives) both are classified as non-steroidal anti-inflammatory agents. Except HPLC, no sensitive methods were reported for both the drugs. HPLC methods suffer from two drawbacks- first; requirement of costly chemicals and second; more time consuming. Because atomic absorption spectroscopy (AAS) methods are simple, sensitive, rapid, reproducible and uses low cost chemicals. The objective of present research work was to develop highly sensitive and economical analytical methods for the quantitative estimation of naproxen and ibuprofen in pharmaceutical formulations by AAS. The methods were based on the reaction of naproxen and ibuprofen with copper and cobalt chloride to form coloured metal complexes. These complexes were extracted with organic solvents and digested with acids. Naproxen and ibuprofen were indirectly estimated by AAS via the determination of the copper and cobalt content in the formed complexes. The proposed methods may be used for routine analysis of pharmaceutical formulations containing aryl propionic acid derivatives and similar pharmaceutical drugs by the analytical chemist.
Gamma-ray spectrometry is a very powerful tool for radioactivity measurements. For low activity samples, using extended sources in gamma-ray spectrometry, will improve the sensitivity of detection. In order to obtain correct results, self attenuation of source matrix which describing the fraction of gamma-rays not registered in the full-energy peak, due to scattering or absorption within the sample, must be taken into consideration. This work includes the calculation of the self attenuation of source matrix alone and the full-energy peak efficiency including this factor.