---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Concrete is the most widely utilized “manmade” material globally for construction in many developing countries in all types of civil engineering works. Also, concrete is an environmental friendly material and in areas of growing environment – relat...

Density functional theory has been used to calculate harmonic normal mode vibrational frequencies for unlabeled and isotope-labeled ubisemiquinones in both the gas phase and in several solvents. It is shown that four methoxy group conformations are likely to be present in solution at room temperature. Boltzmann weighted infrared and Raman spectra for the four conformers were calculated, and com...

The polymer/ferroferric oxide (Fe3O4) foam and aerogel composites generally exhibit superior radar absorptivity performance. However, these have poor mechanical thermal properties. This study manufactured a polylactic acid (PLA)/Fe3O4 bio-composite evaluated the absorptivity, thermal, properties of radar-absorbing material. were prepared using solvent casting method to mix PLA Fe3O4 at varying ...

An increasing desire is to produce eco-friendly materials for varied engineering applications, such as natural fiber-reinforced composites (NFRCs). Although many research works on fiber polymer matrix composite exist, not much known the thermo-mechanical properties of acetic acid-treated particulate banana-sisal reinforced polyester composite. Additionally, establishing constituent with a detri...

frustration: elementary quasiparticles and many-particle bound states. Abstract The excitation spectrum of the two-chain S = 1/2 Heisenberg spin ladder with additional second neighbor frustrating interactions is studied by a variety of techniques. A description, based on a mapping of the model onto a Bose gas of hard-core triplets is used to determine the one-and two-particle excitation spectra...

Carbon dioxide (CO(2)) is the most important anthropogenic greenhouse gas in the present-day climate. Most of the community focuses on its long-term (decadal to centennial) behaviors that are relevant to climate change, but there are relatively few discussions of its higher-frequency forms of variability, and none regarding its subseasonal distribution. In this work, we report a large-scale int...

OBJECTIVE It is proved that acidic soft drinks that are commonly used, have an adverse effect on dental structures, and may deteriorate oral heath of our patients and orthodontic appliances. The aim of this study was to compare the effect of yoghurt drink with other soft drinks on the shear bond strength of orthodontic brackets. MATERIALS AND METHODS Seventy-five first premolar teeth extracte...

We study the random composition of a small family of O(n3) simple permutations on {0, 1}n. Specifically we ask what is the number of compositions needed to achieve a permutation that is close to k-wise independent. We improve on a result of Gowers [1] and show that up to a polylogarithmic factor, n3k3 compositions of random permutations from this family suffice. We further show that the result ...

Recently there has been much interest in blending successful development methods such as agile development and product line engineering into an even more successful hybrid. I will consider one technique for accomplishing this blending. I will briefly present an example that will be discussed in more detail at the Software Product Line Conference (SPLC) in September. In this issue of Strategic S...

The marketing mix refers to variables that a marketing manager can control to influence a brand’s sales or market share. Traditionally, these variables are summarized as the four Ps of marketing: product, price, promotion, and place (i.e., distribution; McCarthy, 1996). Product refers to aspects such as the firm’s portfolio of products, the newness of those products, their differentiation from ...