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Papers by researchinventy Research Inventy

– Metamaterials are broadly defined as a material with properties not found in nature,i.e, a typi... more – Metamaterials are broadly defined as a material with properties not found in nature,i.e, a typically man made material especially designed to achieve certain unusual properties. First applications of metamaterials were in field of electromagnetic waves and some features of these materials were negative permeativity and negative refraction index. Due to similarity with electromagnetic waves, mechanical waves propagation through metamaterials began to be studied and the concept of elastic metamaterials was created. The main property of elastic metamaterial is the negative dynamic effective mass where the wave propagation is blocked.It will be discussed two kinds of unit cell that compound the elastic metamaterial and how some changes in parameters affect the metamaterial negative effective mass.

Current research takes in to account of calorific value of various fuel (Diesel) available in the... more Current research takes in to account of calorific value of various fuel (Diesel) available in the state of Telangana (India). The purpose of this experiment is to determine the heat of combustion for diesel and to learn basic bomb procedures. This experiment will be accomplished by using an adiabatic bomb calorimeter. The fuel sold by different company show different calorific value; by finding out the change in the calorific we can find out the high quality fuel available in the market. This research had covered the importance of calorific value of different fuel (diesel) with the help of a case study from Lords Institute of Engineering & Technology.

We have successfully grown MnGeP 2 thin films on GaAs (100) substrate. A ferromagnetic transition... more We have successfully grown MnGeP 2 thin films on GaAs (100) substrate. A ferromagnetic transition near 320 K has been observed by temperature dependent magnetization and resistance measurements. Field dependent magnetization experiments have shown that the coercive fields at 5, 250, and 300 K are 3870, 1380 and 155 Oe, respectively. Magnetoresistance and Hall measurements have displayed that hole conduction is dominant in MnGeP 2 .

In Ayurveda from ancient time Ocimum Sanctum, AzardirachtaIndica, TriticumAestivum, PhyllanthusEm... more In Ayurveda from ancient time Ocimum Sanctum, AzardirachtaIndica, TriticumAestivum, PhyllanthusEmblica, StrychnosPotatorum etc. natural herbs areproved tobe very useful medicines. Inthe present study effectiveness of these herbs in water purification because of their antibacterial activity is studied.Leaves and fruits of these herbs were dried, extracted and activity was tested by Disc Diffusion Method (Kirby-Bauer Method). In all these herbs maximum removal of E.coli was found at maximum 1% onwards.From the percentage removal of E.coli Ocimum Sanctum was found most effective. 82.15% removal of E.coli was observed for 1% and onward concentration of Ocimum Sanctum.

Low electric currents generated using conductive electrodes have been used to increase the effica... more Low electric currents generated using conductive electrodes have been used to increase the efficacy of antibiotics against bacterial biofilms, a phenomenon termed " the bioelectric effect " that formed metal ions and free radicals which can inhibit the growth of planktonic Staphylococcus aureus (S.aureus) and Escherichia Coli (E.Coli) the effect is amplitude and frequency dependent, the aim of present study to define the parameters that are most effective against bacterial growth also to investigate the comparative study through inactivation of metabolic activities, growth rate, morphology, bacterial conductivity and antibiotic sensitivity between gram negative E.Coli and gram positive S.aureus bacteria by extremely low frequency electric field (ELF-EF). In this work, the frequency of electric impulses that interfere with the bioelectric signals generated during E.Coli and S.aureus cellular division is investigated in order to compare cell viability, number of colony forming units (CFU) and growth rate (optical density at 600nm) bacterial conductivity and antibiotic susceptibility. Also morphological cellular structure was investigated by transmission electron microscope (TEM). The results revealed that a highly significant inhibition effect occurred when S.aureus and E.Coli was exposed to resonance of 0.8, 0.5 Hz square amplitude modulated waves (QAMW) respectively for 2hours exposure .Moreover, exposed cells became more sensitive to the tested antibiotics compared to control. Significant ultra-structural changes occurred as observed by TEM which indicated morphological changes. It will be concluded that, the use of 0.8, 0.5 Hz QAMW in controlling the biological activity of S.aureus and E.coli respectively seems to be a new and promising medical activity.

This research aims to use a demerit system as a method to evaluate the level of the quality of th... more This research aims to use a demerit system as a method to evaluate the level of the quality of the final product. Demerit system was applied as a case study to obtain the research objectives in the factory of transformers and household appliances, which represents as a majority factory in the formations of the general company for Electronic Industries. In this research, the Reflective Product was selected as a sample research. Several of the quantitative and scientific instruments that represent demerit system were used to achieve the research objectives. The results demonstrations that adopted identified each of the level of the quality of the final Reflective Product and standard level of quality are very important during the period of the assessment final product.

Kiswahili one of the compulsory subjects that is nationally examined but there has been complaint... more Kiswahili one of the compulsory subjects that is nationally examined but there has been complaints about poor performance in schools. This paper is a report of a study carried out in 2012 in Kapseret Division of Uasin Gishu County. The study assessed the effects of the language of the catchment area in learning Kiswahili. The study was guided by sociocultural theory (SCT) and was descriptive in nature. Simple random sampling was used to select 15 out of 50 schools in Kapseret Division, it was also used to select 20 %(750) of standard six pupils from each of the selected schools. Purposive sampling was used to select 30 upper primary Kiswahili teachers; one class six Kiswahili teacher and a Kiswahili panel head from the selected schools. Data was collected using questionnaires, observation checklists. It was analyzed using descriptive statistical techniques such as percentages and frequencies. The investigation found out Nandi was the language of the catchment area but Kiswahili was used in communication because of different ethnic communities. Kiswahili be used in schools, parents be sensitized to have a positive attitude towards Kiswahili hence changing the learners attitude.

The micro-tensile behavior of AA7020/carbon black nanoparticle composites was examined by using f... more The micro-tensile behavior of AA7020/carbon black nanoparticle composites was examined by using finite element analysis and representative volume element models for three different volume fractions. The uniform distributions of the nanoparticles were constructed to produce a representative volume element of the composites. The predicted mechanical properties and overall tensile stress-strain by finite element analysis corresponded well to the experimental results at the elastic region and near the yield surface, but the model slightly overestimated the strength of the composites at higher stress. This deviation possibly occurs from micro-mechanical factors, which were not considered in the RVE models. In contrast to FE analysis, fracture of the nanoparticle-matrix debonding occurred because of large localized stress. In the case of a high applied load, non-linear behavior of reinforcements and interfacial strength should be considered to obtain accurate results.

Hydrophilic formate dehydrogenase (FDH) from candida boidinii was chemically modified by coating ... more Hydrophilic formate dehydrogenase (FDH) from candida boidinii was chemically modified by coating it with didodecyldimethylammonium bromide (DDAB). This coating changed the phase behavior of the enzyme, making it highly soluble in hydrophobic solvents and thereby offering the chance for biphasic enzyme recycling from hydrophilic substrates and products. Different coating procedures of FDH with DDAB were investigated and all proved suitable for efficient coating of the enzyme's outer surface. A 50 mM Tris-(hydroxymethyl)-amminomethan (tris) buffer at pH 8 was chosen to make DDAB soluble and avoid aggregation. The reaction of NAD + with uncoated and coated FDH to NADH and CO 2 was monitored by UV-vis spectroscopy and kinetic parameters (r max , K m , K I , E A) for the the FDH were determined. The coated enzyme resulted in a lower relative initial activity between 40-60% compared to the uncoated one. The stability of the coated enzyme (FDH*) was improved significantly and remained stable in long-term experiments, resulting in a deactivation rate k D smaller than 3% per day and a half-life time t 1/2 largerthan 23 days, while the deactivation rate of the uncoated enzyme was 260% per daywitha t 1/2 of 0.3 days. Both activation energies were similar, with 42 kJ mol-1 for the coated and 48 kJ mol-1 for the uncoated enzyme.This result suggests that there is not significant transport resistance originating from the DDAB coating layer. The reason for the significantly lower activity of the coated FDH probably stems from accumulation of formed CO 2 in the coating layer, thereby preventing high equilibrium conversions.

A 7-13 c/s mechanographic signal (amplitude 1-5μV) is detectable over relaxed limbs, phenomenon t... more A 7-13 c/s mechanographic signal (amplitude 1-5μV) is detectable over relaxed limbs, phenomenon termed microvibration (MV). Exposure to mechanographic signals, low frequency noise, on other side, results in vibroacoustic disease. The aim of this study was to investigate the acute effects of vibroacoustically-induced MV in regio nuchae (vibroacoustic device Vitafon, St. Petersburg, Russian Federation) using four different modes of MV of specific amplitude (2.8 μm-12.3 μm) and frequency (30 Hz – 18 kHz) on native undulating electrical CNS activity (EEG registration) in the adult rats. The experiments were performed on Wistar male rats and were divided into control and experimental groups. Rats subjected to the same experimental protocol, but with vibroacoustic treatment switched off, served as controls. EEG activity was registered during application of vibroacoustic MV and following was observed regardless of working regime: none of the graphoelements indicating hyperexcitability; there were no reduction in vigilance; beta rhythm and moderate transition alpha in beta rhythm were observed. Slightly override the beta waves in relation to alpha EEG band, under the stimulus of vibroacoustically-induced microvibration by Vitafon, suggests that mental alertness increased as well as focused attention, with no signs of hyperexcitability in rats.

Variations in the fluoride content of saline water, salt and pan soil from nine different salt pa... more Variations in the fluoride content of saline water, salt and pan soil from nine different salt pans located at the East Coast belt of Tamil Nadu have been documented. Fluoride which is non-degradable and persists in the environment was estimated by Zirconyl-alizarin method. The fluoride level varied from 0.6 to 1.7 ppm. Fluoride level in the salt of Marakkanam (Bore well) was found to be slightly higher than other salt pans.The chemical parameters which are used to study the level of fluoride in saline waters included chloride, sulphate, sodium, magnesium, potassium and calcium.

Ulysses achieved a solar orbit with an inclination of 80.20 0 , perihelion of 1.34 AU, aphelion o... more Ulysses achieved a solar orbit with an inclination of 80.20 0 , perihelion of 1.34 AU, aphelion of 5.4 AU and a period of 6.2 years. By comparing observations taken over nearly all heliolatitudes and two different intervals covering the same radial distances, we are able to separate the radial and latitudinal variations in the solar wind. This paper describes the detailed results of the studies devoted to the solar activity impact on the Earth's upper atmosphere and ionosphere. The methods used in this study are based on the data driven from the Ulysses spacecraft. The primary objective of the Ulysses solar wind plasma investigation uses SWOOPS (Solar Wind Observations over the Poles of the Sun) instrument to investigate and establish bulk flow parameters and internal state conditions of the solar wind as a function of solar latitude. The electron temperature T e and the electron density N e are found to exhibit a sharp enhancement during the ascending half of the solar cycle 23 (1996 – 2004).

This paper conceptualizes a domain specific simulator for requirements prioritization; its aims a... more This paper conceptualizes a domain specific simulator for requirements prioritization; its aims at helping to identify appropriate prioritization strategies for a project in hand. The possible existing scenarios are difficult to analyze; they involve different variables, like the selection of: stakeholders (their availability, expertise, and importance); prioritization criteria; and prioritization methods. To demonstrate the feasibility of the proposed simulator elements, a well established general purpose simulator, called Arena, was used. The results demonstrate that, it is possible to build the suggested scenarios in order to study and make inferences about the prioritization strategies.

Contemporary businesses are surrounded by socio-cultural, economic and environmental complexities... more Contemporary businesses are surrounded by socio-cultural, economic and environmental complexities, which influence their productivity and organizational image. This scenario demands an interdisciplinary management vision able to: cater to the economic necessity that sustains the actual capitalist logic; offer products which are socially responsible, environmentally conscientious and culturally compatible with the socio-organizational reality. Such positions have become fundamental in a society that witnesses innumerable negative impacts that distort or extinguish economic systems, ecosystems, social values and cultural identities. In this sense, this assignment enhances that the sustainable management is constituted by complexes actions that illuminate their environmental, cultural, economic, social and political responsibilities. Nevertheless, through a quant-qualitative analysis ruled by the elaboration of three bibliometric studies, it was planned to present the degree of commitment of the tourism and hotel industry in regard to the social, cultural, economic, political and environmental dimensions inherent in the proposals for sustainable development. What is observable, is that the contemporary hotel and/or tourism management has a predisposition to environmental and/or social external actions, and is not capable of establishing a participative planning to balance all the sustainability dimensions. The aforementioned scenario corroborates the necessity of establishing holistic criteria, which also contemplate the intergenerational solidarity.

Unusual, non-specular, fast-movingmeteortrail echoes are observed in the summer polar upper mesos... more Unusual, non-specular, fast-movingmeteortrail echoes are observed in the summer polar upper mesosphere near 90 km.Usually, at mid-latitudes, field-aligned irregularities cause non-specular trails, while in the polar region long-lasting irregularities are possibly sustained by charged meteor dust.The unusual meteor trails propagate downward and upward at speeds of 3.3-6.4 kms-1 along a slanted path length of 10.4 km between 87-93 km altitudes, merging in the middle and lasting for 8-10s. Here we propose that an electrical discharge is responsible for these trails. The corresponding horizontal electric field for the observed speeds is estimated up to 16.3 Vm-1 at 90 km.Both the long-lasting merging of two fast-moving plasma trails and the modest speed compared to those (~10 4-10 5 ms-1) of lightning leader process and of jets (< 400 ms) occurring above thunderclouds likely suggest a new type of meteor-trail leader discharge occurring in the summer polar upper mesosphere.

BAM is the key element for the real-time achieves management aligned with business strategies. Pr... more BAM is the key element for the real-time achieves management aligned with business strategies. Proposed in this paper are a BAM design framework for the real-time business performance management and an implementation of BAM system prototype to show the applicability of proposed framework. The objectives of business activity monitoring to give real time information about the status and results of many operations, processes, and transactions. yeK benefits of BAM are to enable an enterprise to get better informed business decisions, quickly processing problem areas, and re-position Institutions and Organizations to take full advantage of growing opportunities.

The problem of double diffusive convection with variable viscosity confined between the two horiz... more The problem of double diffusive convection with variable viscosity confined between the two horizontal plates is investigated by the linear stability analysis. The transformed governing equations are numerically solved by using the Galerkin method. We have studied both stationary convection and oscillatory convection. The threshold values of Rayleigh number and wave number are computed and presented for various boundary conditions viz. rigid-rigid (í µí±/í µí±), rigid-free (í µí±/í µí°¹), free-rigid (í µí°¹/í µí±) and free-free (í µí°¹/í µí°¹) and for different values of physical parameters viz., salinity Rayleigh numberí µí± í µí± , Lewis number L, viscosity ratio c and Prandtl numberí µí± í µí±. For rigid-rigid boundary conditions we have studied the effect of í µí±, í µí± í µí± on the vertical velocity and temperature eigenfunctions at the onset. It is observed that the salinity concentration stabilizes the dynamical system. The occurrence of co-dimension two bifurcation point(í µí° ¶í µí±í µí±)is shown for various boundary conditions.

The large current development of aerospace and automotive technologies is based on the use of com... more The large current development of aerospace and automotive technologies is based on the use of composite materials which provide significant weight savings compared to their mechanical characteristics. Correct dimensioning of composite structures requires a thorough knowledge of their behavior in small as in large deflection.This work aims to simulate linear and nonlinear behavior of laminates composites under three-point bending test. The used modelization is based on first-order shear deformation theory (FSDT), classical plate theory (CPT) and Von-Karman's equations for large deflection. A differential equation of Riccati, describing the variation of the deflection depending on the load, was obtained. Hence, the results deduced show a good correlation with experimental curves.

The adsorption isotherms and kinetic models were tested on the comparative sorption of oxyanions ... more The adsorption isotherms and kinetic models were tested on the comparative sorption of oxyanions onto hexadecyltrimethylammonium bromide (HDTMA-Br) surfactant modified kaolinite clay also known as organo-kaolinite clay. The percentage removal of sulphate ion sorption was 40.42% and 78.13% onto MMC and BMC respectively, while chromate ion sorption was 26.72% and 58.62% onto MMC and BMC respectively. Thus, sulphate ion sorption shows better removal compared to chromate ion sorption of 33.60% and 24.97% onto MMC and BMC respectively. Langmuir and Frumkin isotherm models best described the adsorptive mechanism, hence the validity of the Langmuir-type separation factor R L (0<R L <1) was highly favourable and acceptable while the Frumkin isotherm gave the best regression correlation R 2 although sulphate ion sorption responded better than the chromate ion sorption. The initial adsorption rate 'α' and the extent of surface coverage 'β' was higher on sulphate ion sorption compared to chromate ion sorption. In general the models tested predicts exothermic and chemisorption processes.