Anisotropic Bianchi type-I cosmological models have been studied on the basis of Lyra’s\ngeometry. Exact solution has been obtained by considering a time dependent displacement field\nfor constant deceleration parameter and varying models of the universe. The physical behavior\nof the models is examined in the presence of perfect fluids.

In this paper, some special types of surfaces with null Cartan base curve are\ninvestigated. The generating lines of the surfaces are chosen as a linear combination of Cartan frame felds with non-constant differentiable functions. Firstly, the surfaces whose generating lines have the same direction of Cartan frame fields B; N and T are examined respectively. As a special case, Gaussian and Mean curvatures\nof one parameter family of Bertrand curves of a given null Cartan curve and the singular points of this type of surface are stated. Furthermore, an example is also stated to explain the obtained results. Then, the surfaces with null Cartan base curve are investigated where generating lines lie on the planes spanned by fN;Bg;\nfT;Bg and fT;Ng; respectively. Finally, some differential geometric properties of these surface are given mainly in three different cases.

This paper presents a rational comparative study of different refrigerants commonly used in the vapor compression refrigeration systems. The influence of each refrigerant on the performance of vapor compression cycle, overall footprint of refrigeration equipment, refrigeration unit’s initial and annual maintenance cost and environment impact will be investigated. The refrigerants investigated in this research are the most used in the refrigeration industry during the past decades and the differences between them have always been the subject of debate and discussion between scientists and refrigeration system experts. This research provides a solid basis for distinguishing between different refrigerants that may lead to design the best refrigeration system with the highest efficiency and least environmental impact. R410A is the most recommended refrigerant for modern refrigeration systems due to excellent energy performance, high refrigeration effect, low environment impact with relatively low initial investment and maintenance cost.

There are a number of guidelines to assess the nutrition status of cancer cases. None of these guidelines are specifically Head and Neck (HNC) cancer related; except for the European guidelines. This paper reviews the different guidelines in nutrition for cancer cases and also their drawbacks.

A large quantity of sediments is dredged continuously worldwide. They are generally dumped in landfill areas which ensue in the increasing cost of the dredging operations and in soil-groundwater pollution. The objective of this work is to study the beneficial reuse of dredged sediments in foam mortar and particularly by studying the influence of the substitution of sand by dredged sediments. Air foam mortars/concrtes is an alternative to ordinary concrete, which presents the advantages of lightweight and low thermal conductivity. In this study, the density required ranges from 1200kg/m3 to 1600kg/m3 to the development of foam concrete building blocks and slabs for load-bearing and non-load-bearing structures. Twenty foam mortar mixes were prepared. Sediments were introduced by replacing 15%, 30%, and 50% mass of the sand. The foam percentage was introduced from 0% to 100% volume of mortar. Workability, compressive strength, and flexural strength at the age of 7, 28, and 60 days were monitored. The size distribution of foam bubbles and the effect of sediments on their stability is also studied. The results demonstrate that sediment has a good general effect on foam concrete and this opens up very promising new types of concretes. However, for a high substitution rate, a decrease in performances is denoted.