Concrete is a brittle material with a low tensile strength. Fibres when added to concrete increases strength, toughness and ductility. The addition of fibres improves the post-cracking behaviour of concrete. In this project, the strength characteristics of hybrid fibre reinforced concrete is studied experimentally by testing cubes, cylinders and prisms under compression, tension and flexure. Fibres used are glass and steel fibres. The combinations of different types of fibres potentially will improve the overall performance of concrete. Admixtures silica fume and fly ash improves workability of concrete. M25 grade concrete was investigated with addition of steel fibres and glass fibres with admixtures silica fume and fly ash. The test results shows that use of hybrid fibre reinforced concrete with admixtures improves compression, split tensile and flexural performance.

Fibre Reinforced Concrete, Glass Fiber, Steel Fiber, Fly Ash, Silica Fume.

Palembang is the capital of South Sumatra Province which has the character as a city of water. In the Sultanate of Palembang in the 16th century, space for a settlement began to lead to land but remain on the boundary river waters. In a further development of this housing is known as home form Limas Palembang. Limas house Palembang is experiencing rapid development in the Sultanate of Palembang Darussalam based on Islam. It is affecting the decoration on the elements of the building, as seen from the interior ornaments that include Arabic script. Meru roof shape (limas) and roof ornament (simbar and tanduk kambing) with both ends pointing upwards, is like on the roofs of traditional buildings in the central states of Hinduism and Buddhism. Namely in the East Asian region that embraces the cosmological principle in the design architecture. By using the method of qualitative research, based on the literature, and survey of the building is still there. It can be concluded that the relation or link between Form and Function in limas house Palembang inseparable from an important goal in architecture, namely the balance and harmony of form.

Indian prime industries are facing a lot of competitions nowadays due to the problem of globalization. To keep in race, every industry has to be up to date especially in the area of technology involved in it. Indian open cast coal mining is still far behind in global standards in spite of implementation and use of best technologies. Presently the Open cast Coal mining industries warrants for state of the art technology. Energy security is the prime concern of Indian economy which is distressing Indian industries a lot. The problem lies in the implementation and its effective management. The way in which internal planning and implementation processes are managed could greatly influence the outcome of new technology. For this purpose, one of the public sector organizations namely Central Coalfields Limited, located at Ranchi, Jharkhand is being selected.

Effective management, Strategy planning, Technology, Open cast coal mining.

This paper presents a novel design of stacked microstrip antenna array for MIMO systems. An aperture coupled feeding technique with rectangular slots has been used to ensure equal coupling to each radiating slots. The antenna system is a layered structure consisting of two driven patches and two parasitic patches. The proposed antenna uses FR4 substrate with dielectric constant 4.4 and height 1.57 mm. The designed structure covers A BROAD wireless band from 5.59 GHz to 5.86 GHz with impedance bandwidth of 270 MHz. Antenna shows gain of 6.828dBi and CORE;ETOION COEFF of 0.35. These characteristics make this antenna suitable for wireless MIMO communications. To deploy the antenna in MIMO system S₁₁, diversity gain, envelope correlation coefficient (ECC) and capacity analysis is also carried out.

: Stacked, aperture coupled, MIMO, S₁₁, diversity gain, ECC, capacity, CST MWS’14, MATLAB r’11

Attempts are made to construct three-dimensional complex dynamical invariant by using Lie- algebraic method to study complex dynamical systems on the extended complex phase. Such invariants play an important role in the analysis of complex trajectories with regard to the calculation of semi-classical coherent state propagator in the path integral method.

Complex Hamiltonian; Exact complex invariant.

In this paper, we first introduce new class of homeomorphism called regular generalized weakly homeomorphism (briefly rgw-homeomorphism) in topological space and after that we compare this new class of homeomorphism with recently introduced generalized form of homeomorphism. Moreover, we study algebraic properties of the family of rgw - homeomorphism in topological space.

rgw-homeomorphism; topological space.

In the present study, Ba_1-x Mg_x La_xFe_12-xO₁₉ (x =0. 1, 0.2, 0.3, 0.4 and 0.5) hexaferrites are prepared by sol-gel auto combustion method and subsequent heat treatment from 500⁰C to 900⁰C. The crystal structure, grain size, optical properties, dielectric properties, thermal properties and magnetic properties are studied by means of X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet visible near infrared (UV-Vis-NIR), inductance capacitance resistance meter bridge (LCR meter) , thermo gravimetric analysis (TGA)/ differential thermal analysis (DTA)/differential scanning calorimeter (DSC) and vibrating sample magnetometer (VSM). XRD studies indicate that barium hexaferrite still maintained the hexagonal magneto-plumbite phase after substitution of La-Mg and calcination. DTA studies show that the formation of hexaferrite phase takes place nearly at 800⁰C. VSM analysis reveals an increase in saturation magnetization, coercivity, retentivity and anisotropy constants with increase in substituent.

Magnetic materials; Magnetic properties; Microstructure; Optical properties; Dielectric properties; Fourier transform infrared spectroscopy (FTIR).

1. (i)We report here the successful synthesis of La-Ma doped Barium hexaferrite using sol gel method.
2. (ii)There is remarkable change in magnetic properties like retentivity, coercivity and saturation magnetization with temperature.
3. (iii) Materials show normal ferrite behaviour and band gap increases with substituion.

In the present work, magnetic nanoparticles of Zn_0.5Ni_0.5Fe₂O₄ ferrite were synthesized using citrate precursor method. These nanoparticles were sintered at different temperatures ranging from 300⁰C to 1000⁰C. Structural studies were carried out with X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Single-phase formation of spinel structure with cubic symmetry has been confirmed from the XRD patterns. The particle size and distribution was further checked by transmission electron microscope (TEM).Formation of spinel structure was confirmed from the spectra of FTIR. The investigation shows the increase in particle size with the increase in annealing temperature. The M-H loop at room temperature has been traced using vibrating sample magnetometer (VSM). The absence of magnetic parameters such as remanent magnetization, coercivity, hysteresis of the M-H curve and non zero magnetic moments indicate the existence of superparamagnetism in the magnetic nanoparticles.

Ferrite; superparamagnetism; structural properties.

1. (i) Zn_0.5Ni_0.5Fe₂O₄ ferrite is successfully synthesized by sol-gel method
2. (ii)Superparamagnetic behaviour has been obsered in the synthesized ferrite.
3. (iii)The grain size of the ferrite lie in nano range.

In the present work, magnesium ferrite (MgFe₂O₄) nanostructures are fabricated by sol-gel method. Structural studies are carried out using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The XRD patterns of MgFe₂O₄ show single-phase formation of FCC spinel structure. The average particle size of samples sintered at different temperatures (300-800°C) is controlled in the nano-range i.e. ~ 10 nm. The crystallinity shows increment with increasing sintering temperature. Formation of spinel structure is confirmed using FTIR. The magnetic measurements are made from M-H hysteresis loops traced at room temperature using vibrating sample magnetometer (VSM). It is found that ferrites in the nanoregime are found to behave as single domain. The low temperature (300°C) sintered ferrite has almost zero coercivity and retentivity which shows superparamagnetic behaviour of the as-prepared ferrite.

Ferrite; superparamagnetic; VSM.

1. (i)The sol-gel method is efficient for synthesizing MgFe₂O₄ nanoparticles possessing unique spinel structure, superparamagnetic properties and enhanced magnetic properties.
2. (ii)Apart from size of the particles, the behaviour of nanoferrites also depends upon preparation parameters.
3. (iii)The samples are resulting in comparatively smaller magnetizations and coercivities as the sintering temperature is lowered.