Evaluation Of Several Properties Research Articles

Application of Brick Dust and Sawdust in Concrete: A Movement to Sustainability

It has become essential to recycle materials to create a sustainable environment, the application of using brick dust and glass powder leads to the reduction in the emission co2 and environmental landfills caused by the production of cement, disposal issues relating to solid waste, and demolished structures. The outcome of this research observes that the use of brick dust and sawdust in concrete helps in reducing the cost of the product, decreasing the amount of emitted CO2 as well as providing a way for environmental byproducts to be reduced by utilized for better sustaining of the ecosystem. In accordance with this study the evaluation of several properties of concrete was determined, the properties include compression test, split tensile test, compacting factor, slump for workability, density in the fresh and hardened state, and the ultrasonic pulse velocity of the concrete. The study used 10% brick dust as cement substitute and 5% by volume as substitute for fine aggregate. The outcome shows that the incorporation of brick dust increases the compressive strength and tensile strength, reduces workability, and has excellent quality of compactness which is 0.91, the compacting factor of just sawdust is seen to be 0.86, sawdust reduces the strength of concrete, and can be almost designated as light concrete due to the low density obtained and when both materials are added in one concrete the properties values as they have a different effect on the concrete separately. Overall, the application of this material in the same concrete as replacement proves beneficial and can be applied for construction.

Tissue-Like 3D Standard and Protocols for Microscope Quality Management.

This article outlines a global study conducted by the Association of Biomedical Resource Facilities (ABRF) Light Microscopy Research Group (LMRG). The results present a novel 3D tissue-like biologically relevant standard sample that is affordable and straightforward to prepare. Detailed sample preparation, instrument-specific image acquisition protocols and image analysis methods are presented and made available to the community. The standard consists of sub-resolution and large well characterized relative intensity fluorescence microspheres embedded in a 120 µm thick 3D gel with a refractive index of 1.365. The standard allows the evaluation of several properties as a function of depth. These include the following: 1) microscope resolution with automated analysis of the point-spread function (PSF), 2) automated signal-to-noise ratio analysis, 3) calibration and correction of fluorescence intensity loss, and 4) quantitative relative intensity. Results demonstrate expected refractive index mismatch dependent losses in intensity and resolution with depth, but the relative intensities of different objects at similar depths are maintained. This is a robust standard showing reproducible results across laboratories, microscope manufacturers and objective lens types (e.g., magnification, immersion medium). Thus, these tools will be valuable for the global community to benchmark fluorescence microscopes and will contribute to improved scientific rigor and reproducibility.

Influence of recycled concrete aggregates and Coal Bottom Ash on various properties of high volume fly ash-self compacting concrete

The mechanical and durability behavior of Recycled concrete aggregates (RCA) based High volume fly ash-Self compacting concrete (HVFA-SCC) has been examined through detailed experimental investigation. The article explores the overall behavior of HVFA-SCC made with 0%, 25%, 50%, 75% and 100% of RCA with alteration of Natural coarse aggregates (NCA) and in conjunction with 10% of Coal bottom ash (CBA) as alteration of Natural fine aggregates (NFA) through evaluation of several properties. Various mechanical tests (Compressive and Tensile strength) and durability tests (Accelerated carbonation, Electrical resistivity, Rapid chloride penetration-chloride permeability, Capillary suction, Initial surface absorption, Ultrasonic pulse velocity-UPV) were carried on HVFA-SCC mixes prepared with specific amounts of RCA, Fly ash (FA) and CBA. The findings confirmed the feasibility of HVFA-SCC made with alteration of NFA/NCA with CBA/RCA at specific levels respectively resulting in reasonable performance with respect to aforesaid properties. Projecting three (3) way benefits (i.e. Portland cement (PC) with HVFA; NFA with CBA and NCA with RCA) probably leads to widespread usage and recycling of by-products generated from the coal (FA and CBA) and construction industry (RCA) respectively. Such an effort assures the minimization of concerns like regulation and disposal of coal and construction industry wastes/by-products to a significant extent.

Quality characteristics of dried pasta enriched with buckwheat flour

Summary The addition of pseudocereal flours to semolina is becoming more and more popular to improve the nutritional quality of the resultant pasta. The aim of this study was the evaluation of several properties of commercial pasta made from a mixture of buckwheat flour and durum wheat semolina. The characterisation of products, belonging to different producers, focused on the evaluation of chemical and physical properties, such as water uptake and mechanical properties before and after cooking and surface characteristics. A sensory analysis was also performed in order to evaluate firmness, resistance to breaking and overall acceptability. The results highlighted high heterogeneity of the mechanical properties, solid loss and water absorption among the samples. The great variability could be explained by the different processing conditions adopted by each producer, particularly by the procedure used to form and shape the dough into the final product.

Model pseudopotentials and electronic properties of non-transition metals

Two new model pseudopotentials for electron-ion interaction in metals are proposed which contain a single adjustable parameter r c , the radius of the ion core. The models are used in the evaluation of several properties like electrical resistivity (liquid and solid metals), thermoelectric power, electron dispersion, Fermienergy, density of states and electronic susceptibilities of certain non-transition liquid metals. The obtained results are largely satisfactory with available theoretical and experimental values. The study reveals that the present model pseudopotentials have improved in most of the cases the previous results of other one parameter models.

A Model Pseudopotential in Metallic Properties

AbstractA new pseudopotential model (distinct from the Ashcroft model) having only one parameter rc (core radii) of the metal has been proposed. The present model as well as Ashcroft's model have been used in evaluation of several properties like electrical resistivity and thermoelectric power of liquid metals, electrical resistivity of solid metals, temperature dependence of Knight shift at constant volume and constant pressure, and Fermi energy and density of states of simple metals. A new correction term for thermoelectric power has been given, which gives a better result for lithium and cesium. The results obtained have been compared with possible experimental and theoretical data. Good agreement has been achieved.

The Band Fluorescence of Mercury Vapor

The band fluorescence of mercury vapor excited by the 2537A atomic line has been studied during the afterglow. Time sampling techniques were employed to overcome difficulties attending the measurement of very low-intensity radiations. The two main band constituents (centered at 4850A and 3350A) were found to decay simultaneously under all conditions investigated. The temporal structure of the decaying fluorescence was found to be characterized by two time constants and has the form associated with chain types reactions. The two time constants and the relative intensities of the 4850A and 3350A bands were measured for a range of vapor densities at a fixed vapor temperature. In order to evaluate the role of diffusion in the lifetime of the excited particles involved, measurements were made in vessels of two different sizes.The experimental results have led to an interpretation according to which the optically excited $\mathrm{Hg}(^{3}P_{1})$ atoms are converted into metastable $\mathrm{Hg}(^{3}P_{0})$ atoms by inelastic collisions. The $\mathrm{Hg}(^{3}P_{0})$ atoms are then converted in a three-body collision reaction to metastable ${\mathrm{Hg}}_{2}({^{3}0_{u}}^{\ensuremath{-}})$ molecules which, in turn, may be destroyed in the vapor by either one of two processes, i.e., by spontaneous radiation to the ground state, giving rise to the 3350A band, or by a second three-body collision through which the emission of the 4850A band is induced. An analysis based upon this picture has permitted the quantitative evaluation of several properties of the particles involved. The diffusion coefficient of the $\mathrm{Hg}(^{3}P_{0})$ atom was found to be 210 ${\mathrm{cm}}^{2}$/sec for a density of ${10}^{16}$ atoms/cc and a temperature of 200\ifmmode^\circ\else\textdegree\fi{}C; the diffusion coefficient of the ${\mathrm{Hg}}_{2}({^{3}0_{u}}^{\ensuremath{-}})$ molecules is 88 ${\mathrm{cm}}^{2}$/sec under the same conditions. The spontaneous radiation rate of the ${\mathrm{Hg}}_{2}({^{3}0_{u}}^{\ensuremath{-}})$ molecules is 20 ${\mathrm{sec}}^{\ensuremath{-}1}$ and the three-body collision induced radiation rate is 21\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}32}$ ${(\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{m}\mathrm{s}/\mathrm{c}\mathrm{c})}^{\ensuremath{-}2}$ ${\mathrm{sec}}^{\ensuremath{-}1}$. The three-body destruction rate for the $\mathrm{Hg}(^{3}P_{0})$ atoms is 100\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}32}$ ${(\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{m}\mathrm{s}/\mathrm{c}\mathrm{c})}^{\ensuremath{-}2}$ ${\mathrm{sec}}^{\ensuremath{-}1}$. It was also found that the ${\mathrm{Hg}}_{2}({^{3}0_{u}}^{\ensuremath{-}})$ molecules are approximately 90 percent reflected by the glass walls of the enclosure. The diffusion coefficient obtained for $\mathrm{Hg}(^{3}P_{0})$ atoms is in agreement with the results of other work and the three-body collision rates are comparable with those for similar processes investigated elsewhere.