Search results

This paper aims to provide a focused review on the geometrical designs for performance enhancement of piezoresistive microaccelerometers.

By analyzing working principle and conventional geometries, the improved research proposals are sorted into three groups in terms of their anticipated objectives, including sensitivity, resonant frequency and cross-axis sensitivity. Accessible methods are outlined and their merits and demerits are described.

Novel geometries obviously enhance the performance of accelerometers, and the efficacy can be further elevated by newer materials and fabrication processes.

This paper mainly focused on the improved geometrical designs for sensitivity, resonant frequency and cross-axis sensitivity. Other performance parameters or design schemes are not included in this paper.

This paper generalizes the available geometries and methods for the enhancement of sensitivity, resonant frequency and cross-axis sensitivity in piezoresistive accelerometers design.

Global recession is a serious issue to both the developed and developing economies. Reports published by the Ministry of Statistics and Programme Implementation (2019–20) have revealed that the growth of gross domestic products (GDPs) has shrunk significantly in the last few quarters. Due to such recession productions by many, manufacturing industries have reduced significantly, and a large number of people have lost their work, and scope of new job creations has also decreased. Food sector has also been affected by global recession (Agbedeyi & Adigwe, 2018). Food Processing Industry (FPI) is India's one of the most sunshine manufacturing industries and ranks fifth among the Indian industries in terms of production, consumption, and exports. The country ranks second in global ranking in terms of producing food products next to China. Despite the global recession, the FPIs helped the Indian economy to maintain the growth of the GDP and have created new job opportunities. Around 70 lakh persons are employed in both registered and unregistered food processing units in India. The value of food exported in the year 2018–19 was US $35.30 billion which was 10.69% of India's total export (i.e. US$330.67 billion) (MoFPI report, 2018–19). In this backdrop, the present chapter will try to find out the role of FPI in the Indian economy and will also highlight the prospects of this industry in the coming years.

History teaches us that the glorious victory of mankind across the centuries was accomplished through the successful use of information. The gigantic progressions and rapid transformation of human societies have endorsed legitimacy of abundant data, multiple dynamic variables & critical complexities which reinforce the academia and researchers for understanding and pioneering into ‘Big Data Analytics (BDA)’. Health is one of the vibrant socio-economic variables which have correlations with other aspects of life, that is, education, poverty, income, etc. In fact, there are unending debates whether health can be a basic input for a holistic developmental process or it is the outcome of various developmental factors. BDAs are being used across various sectors of the economy. The developed nations have been yielding most feasible solutions using various forms of analysis of big data. Astronomical research has been using a large quantum of data for accomplishing various satellite projects, space technology, and numerous space missions for the astronaut. With the advent of fourth industrial revolution, the world community has been thriving toward a new age technological innovations that include artificial intelligence, machine learning, block chain technology, etc., which act a pivotal tool for BDAs. In the health sector, application of BDAs has been attempted and experimented in the developed nations which have resulted prolific and sustainable solutions to the most typical cumbersome problems. This chapter has demonstrated how BDAs can make progressive reforms in the Indian Health sector outlining the present status and emerging challenges.

This research numerically investigates the steady laminar 3D forced convective flow and heat transfer of a rotating Al₂O₃/water nanofluid past a linearly stretching sheet with the help of a novel two-phase analysis method by considering different nanoparticle shapes as well as velocity slip boundary condition plus internal heating.

The authors’ novel two-phase analysis method implements the Jang and Choi model for the effective thermal conductivity and incorporates it with Tiwari–Das mathematical model. Besides, the shape factors of the nanoparticles have also taken into account using the Timofeeva model for effective dynamic viscosity. The Prandtl number of the base fluid is kept constant at 6.2 and the temperature of the nanoparticles as well as the base fluid molecules is assumed to be 300 K. In short, after using the similarity transformation method, the obtained dimensionless nonlinear ODEs are numerically solved using the bvp4c built-in function from MATLAB. The governing parameters are solid volume concentration, rotation parameter, velocity slip parameter, heat generation or absorption parameter and Prandtl number of the base fluid.

It is argued that when the cylindrical shape for alumina is chosen, the maximum values for skin friction coefficients and local Nusselt number have been obtained among the other shapes. Further, the velocity slip enhancement in this problem will lead to a drastic reduction in the foregoing quantities of engineering interest.

To the best of the authors’ knowledge, this research is a novel attitude to two-phase nanofluid model.

The purpose of this paper is proposed a new structure design for high performance accelerometer.

An improved sensitivity structure considering sensitivity, natural frequency and cross-axis sensitivity is established and realized. The proposed structure was designed to improve the trade-off between the sensitivity and the natural frequency of piezoresistive accelerometer and eliminate the lateral sensitivity effect by the specific configuration, which is made possible by incorporating slots into the eight-beam structure. The mechanical model and its mathematical solution are established for calculating the sensitivity and natural frequency behavior of the designed structure. The developed sensor is fabricated on the n-type single-crystal silicon wafer and packaged for experiment. The accelerometer prototype was tested in the centrifugal machine and dynamic calibration system.

The experimental results show that the sensitivity of the designed sensor is 0.213 mV/(Vg) and the natural frequency of the sensor is 14.22 kHz. Compared with some piezoresistive accelerometers in literatures, the designed sensor possesses a suitable characteristic in sensitivity, natural frequency and transverse effect, which allows its usage in measuring high frequency vibration signals.

The accelerometer with slotted eight-beam structure shows a good performance in the static and dynamic experiments and can be used in measuring high frequency vibration signals.

This study applies a decision support tool to prioritize the various drivers that influence employee suggestion schemes (ESSs) in both public and private organizations based in the Gulf Cooperation Council (GCC) countries for better organizational performance.

Using theories of organizational creativity, an analytic hierarchy process (AHP) model was developed with 5 criteria and 24 sub-criteria. Data were collected from executives (n = 48) from both public and private organizations in the GCC. Later, the data were interpreted with a priority vector assigned to each criterion and sub-criterion.

The results indicate that leaders/management support, individual traits and organization culture are the key drivers that influence employees' involvement in an ESS.

The study is limited to a small sample size, and data were collected only in three GCC countries. The study provides insights into ESS in the context of developing countries and is a relevant contribution to both theory and practice. The results will be of interest to businesses and academics for improving understanding on the various enablers of successful employee participation programme implementation and subsequent increase in organizational performance in the GCC.

The novelty of this study is that it resolves the lack of empirical research in the Middle East countries/GCC. The transition phase of knowledge-based economies highlights the significance of innovation and creativity through active employee participation to improve business results. The study attempts to prioritise both individual- and organizational-level drivers for promoting ESS by leveraging theories of creativity in alignment with the GCC National Innovation Agenda. This study can be generalized from the GCC context due to homogeneity in organizational governance and cultural aspects.

The purpose of this paper is to present an analytical study for a problem of unsteady free convection boundary layer flow past a periodically accelerated vertical plate with Newtonian heating (NH).

The equations governing the flow are studied in the closed form by using the Laplace transform technique. The effects of various physical parameters are studied through graphs and the expressions for skin friction, Nusselt number and Sherwood number are also derived and discussed numerically.

It is observed that velocity, concentration and skin friction decrease with the increasing values of Sc whereas temperature distribution decreases in the increase in Pr in the presence of NH.

This study is limited to a Newtonian fluid. This can be extended for non-Newtonian fluids.

Heat and mass transfer frequently occurs in chemically processed industries, distribution of temperature and moisture over agricultural fields, dispersion of fog and environment pollution and polymer production.

Free convection flow of coupled heat and mass transfer occurs due to the temperature and concentration differences in the fluid as a result of driving forces. For example, in atmospheric flows, thermal convection resulting from heating of the earth by sunlight is affected differences in water vapor concentration.

The authors have studied heat and mass transfer effects on unsteady free convection boundary layer flow past a periodically accelerated vertical surface with NH, where the heat transfer rate from the bounding surface with a finite heat capacity is proportional to the local surface temperature, and which is usually termed as conjugate convective flow. The equations governing the flow are studied in the closed form by using the Laplace transform technique. The effects of various physical parameters are studied through graphs and the expression for skin friction also derived and discussed.