Search results
1 – 10 of 854P.V. Natarajan, D.G. Vaiude and B.M. Rao
This paper concerns an all‐solid‐state, high‐contrast electroluminescent (EL) flat panel display which is becoming the potential for multifunctional avionic displays. In this…
Abstract
This paper concerns an all‐solid‐state, high‐contrast electroluminescent (EL) flat panel display which is becoming the potential for multifunctional avionic displays. In this ACTFEL (a.c. thin film electroluminescent flat panel) device, an active layer, doped with manganese (ZnS:Mn) is sandwiched between the two dielectric layers followed by conductive layers. All the layers are transparent except the back conductive layer. In the basic mode of operation, an alternating voltage is applied across any two crossing electrodes. When this voltage exceeds the ‘threshold voltage’, light is emitted from the active layer. EL mechanism (the generation of electrons, acceleration of these electrons to optical energies, and collision excitation of the Mn ions yielding light emission) occurs within the film or at the surface of the ZnS:Mn layer. A bright yellow light, in the visible region and with a relatively broad spectrum, is emitted. The TFEL display's thinness, compactness, low weight, moderately low power requirements and durability are its prime advantages. The characteristics of various thin films utilised in TFEL have been studied, and the data in this paper show the optimum requirements for luminance, efficiency and reliability of the light emission in ACTFEL.
Miloš Somora, A.P. Hilley, H. Binner, Gábor Hársanyi, M.S. Vijayaraghavan, Tao Sung Oh, T. Laine‐ Ylijoki, P. Collander, Boguslaw Herod, Peter Barnwell and David Lowrie
‘Soldering and Cleaning in Electronics’ international conference, including an exposition, took place in Brno on 12–13 October 1993. The conference was organised by SMT‐Info…
Abstract
‘Soldering and Cleaning in Electronics’ international conference, including an exposition, took place in Brno on 12–13 October 1993. The conference was organised by SMT‐Info, together with the ISHM‐Czech and Slovak Chapter. The purpose of this common action was to bring together the professionals in surface mount technology and thick film technology. In the framework of the conference, in which 130 home and foreign delegates participated, the annual meeting of the ISHM‐Czech and Slovak Chapter took place.
Can Ban, Na Na Pu, Yi Fei Zhang and Ma Wentao
This article aims to develop an accurate and efficient meshfree Galerkin method based on the strain smoothing technique for linear elastic continuous and fracture problems.
Abstract
Purpose
This article aims to develop an accurate and efficient meshfree Galerkin method based on the strain smoothing technique for linear elastic continuous and fracture problems.
Design/methodology/approach
This paper proposed a generalized linear smoothed meshfree method (LSMM), in which the compatible strain is reconstructed by the linear smoothed strains. Based on the idea of the weighted residual method and employing three linearly independent weight functions, the linear smoothed strains can be created easily in a smoothing domain. Using various types of basic functions, LSMM can solve the linear elastic continuous and fracture problems in a unified way.
Findings
On the one hand, the LSMM inherits the properties of high efficiency and stability from the stabilized conforming nodal integration (SCNI). On the other hand, the LSMM is more accurate than the SCNI, because it can produce continuous strains instead of the piece-wise strains obtained by SCNI. Those excellent performances ensure that the LSMM has the capability to precisely track the crack propagation problems. Several numerical examples are investigated to verify the accurate, convergence rate and robustness of the present LSMM.
Originality/value
This study provides an accurate and efficient meshfree method for simulating crack growth.
Details
Keywords
Subbarama Kousik Suraparaju, Arjun Singh K., Vijesh Jayan and Sendhil Kumar Natarajan
The utilisation of renewable energy sources for generating electricity and potable water is one of the most sustainable approaches in the current scenario. Therefore, the current…
Abstract
Purpose
The utilisation of renewable energy sources for generating electricity and potable water is one of the most sustainable approaches in the current scenario. Therefore, the current research aims to design and develop a novel co-generation system to address the electricity and potable water needs of rural areas.
Design/methodology/approach
The cogeneration system mainly consists of a solar parabolic dish concentrator (SPDC) system with a concentrated photo-voltaic module at the receiver for electricity generation. It is further integrated with a low-temperature thermal desalination (LTTD) system for generating potable water. Also, a novel corn cob filtration system is introduced for the pre-treatment to reduce the salt content in seawater before circulating it into the receiver of the SPDC system. The designed novel co-generation system has been numerically and experimentally tested to analyse the performance at Karaikal, U.T. of Puducherry, India.
Findings
Because of the pre-treatment with a corn cob, the scale formation in the pipes of the SPDC system is significantly reduced, which enhances the efficiency of the system. It is observed that the conductivity, pH and TDS of seawater are reduced significantly after the pre-treatment by the corncob filtration system. Also, the integrated system is capable of generating 6–8 litres of potable water per day.
Originality/value
The integration of the corncob filtration system reduced the scaling formation compared to the general circulation of water in the hoses. Also, the integrated SPDC and LTTD systems are comparatively economical to generate higher yields of clean water than solar stills.
Details
Keywords
Sudarsana Jena and Ankur Gupta
Considering its vast utility in industries, this paper aims to present a detailed review on fundamentals, classification and progresses in pressure sensors, along with its wide…
Abstract
Purpose
Considering its vast utility in industries, this paper aims to present a detailed review on fundamentals, classification and progresses in pressure sensors, along with its wide area of applications, its design aspects and challenges, to provide state-of-the-art gist to the researchers of the similar domain at one place.
Design/methodology/approach
Swiftly emerging research prospects in the micro-electro-mechanical system (MEMS) enable to build complex and sophisticated micro-structures on a substrate containing moving masses, cantilevers, flexures, levers, linkages, dampers, gears, detectors, actuators and many more on a single chip. One of the MEMS initial products that emerged into the micro-system technology is MEMS pressure sensor. Because of their high performance, low cost and compact in size, these sensors are extensively being adopted in numerous applications, namely, aerospace, automobile and bio-medical domain, etc. These application requirements drive and impose tremendous conditions on sensor design to overcome the tedious design and fabrication procedure before its reality. MEMS-based pressure sensors enable a wide range of pressure measurement as per the application requirements.
Findings
The paper provides a detailed review on fundamentals, classification and progresses in pressure sensors, along with its wide area of applications, its design aspects and challenges, to provide state of the art gist to the researchers of the similar domain at one place.
Originality/value
The present paper discusses the basics of MEMS pressure sensors, their working principles, different design aspects, classification, type of sensing diaphragm used and illustration of various transduction mechanisms. Moreover, this paper presents a comprehensive review on present trend of research on MEMS-based pressure sensors, its applications and the research gap observed till date along with the scope for future work, which has not been discussed in earlier reviews.
Details
Keywords
G. Gunasekaran, R. Natarajan, V.S. Muralidharan, N. Palaniswamy and B.V. Appa Rao
Phosphonic acids are good complexing agents. However, they are not good as inhibitors except for a very few. Synergistic inhibition is offered in the presence of metal cations…
Abstract
Phosphonic acids are good complexing agents. However, they are not good as inhibitors except for a very few. Synergistic inhibition is offered in the presence of metal cations like Ca2+, Mg2+, Zn2+ and others in neutral media. The zinc ion is an ideal choice. The part of zinc ions are now replaced by polymers, azoles to prepare eco‐friendly inhibitor formulations. They are also used as corrosion inhibitors in concrete, coatings, rubber blends, acid cleaners, anti‐freeze coolants, etc. Discusses the various applications of phosphonic acids and their action mechanisms.
Jiwoon Lee, Jesse Walker, Sanjay Natarajan and Sung Yi
Extrusion-based additive manufacturing (AM) has been considered as a promising technique to fabricate scaffolds for tissue engineering due to affordability, versatility and…
Abstract
Purpose
Extrusion-based additive manufacturing (AM) has been considered as a promising technique to fabricate scaffolds for tissue engineering due to affordability, versatility and ability to print porous structures. The reliability and controllability of the printing process are necessary to produce 3D-printed scaffolds with desired properties and depend on the geometric characteristics such as porosity and pore diameter. The purpose of this study is to develop an analytical model and explore its effectiveness in the prediction of geometric characteristics of 3D-printed scaffolds.
Design/methodology/approach
An analytical model was developed to simulate the geometric characteristics of scaffolds produced by extrusion-based AM using fluid mechanics. Polycaprolactone (PCL) was chosen as a scaffold material and was assumed to be a non-Newtonian fluid for the model. The effectiveness of the model was verified through comparison with the experimental results.
Findings
A comparison study between simulation and experimental results shows that strut diameter, pore size and porosity of scaffolds can be predicted by using extrusion pressure, temperature, nozzle diameter, nozzle length and printing speed. Simulation results demonstrate that geometric characteristics have a strong relationship with processing parameters, and the model developed in this study can be used for predicting the scaffold properties for the extrusion-based 3D bioprinting process.
Originality/value
The present study provides a prediction model that can simulate the printing process by a simple input of processing parameters. The geometric characteristics can be predicted prior to the experimental verification, and such prediction will reduce the process time and effort when a new material or method is applied.
Details
Keywords
Thamaraiselvan Natarajan and Deepak Ramanan Veera Raghavan
Building on stimulus organism response theory, this study aims to examine the influence of Integrated store service quality (ISSQ) on omnichannel shoppers’ attachment to the…
Abstract
Purpose
Building on stimulus organism response theory, this study aims to examine the influence of Integrated store service quality (ISSQ) on omnichannel shoppers’ attachment to the integrated store with the mediating role of omnichannel customer engagement (CE) dimensions (absorptive attention, enthusiastic participation and social connection). This research demonstrates the effect of customers’ attachment to the integrated store on the willingness to pay more for omnichannel services and products of the retailer, their cross-buying behaviors in future purchases and loyal webrooming intentions. The moderating role of perceived relationship investment and alternative retailer attractiveness (ARA) in a few proposed relationships was also tested.
Design/methodology/approach
The research is descriptive, quantitative and cross-sectional investigation. A purposive sampling technique was used for selecting the study respondents. The data was collected from n = 589 Indian omnichannel shoppers who have experience shopping in the brick and mortar store of channel-integrated stores using a validated self-administered questionnaire. The proposed conceptual model was tested using PLS-SEM.
Findings
The results indicate that omnichannel CE dimensions (absorptive attention, enthusiastic participation and social connection) positively mediate the relationship between ISSQ and customer attachment to the store. Customer attachment to the store significantly impacts their willingness to pay more, cross-buying behaviors and loyal webrooming intentions. The moderating effect of the customer-perceived relationship investment and ARA revealed that it significantly impacted the relationship between ISSQ and willingness to pay more, cross-buying behaviors and loyal webrooming intentions. This research also demonstrated the direct impact of ISSQ on willingness to pay more, cross-buying behaviors, loyal webrooming intentions and the indirect impact through different CE dimensions and attachment with the store.
Research limitations/implications
The study is conducted in the Indian population, where omnichannel retailing is still nascent.
Originality/value
This study addresses the need to investigate the impact of CE and their attachment to stores driven by the in-store service quality of integrated stores on the various postpurchase consumer behaviors. To the best of the authors’ knowledge, this study is the first to show that ISSQ might affect their willingness to pay more, cross-buying behaviors and loyal webrooming intentions through different CE dimensions and their attachment to the store. The moderating effect of customer-perceived ARA and their perception of retailers’ investment in a relationship on proposed hypotheses was also tested.
Details
Keywords
Thamaraiselvan Natarajan, Deepak V. Ramanan and Jegan Jayapal
Building on stimulus organism response theory, the current study examines the influence of pickup service quality of buy online, pickup in-store (BOPIS) service on the BOPIS…
Abstract
Purpose
Building on stimulus organism response theory, the current study examines the influence of pickup service quality of buy online, pickup in-store (BOPIS) service on the BOPIS users' satisfaction, trust and commitment, subsequently leading to customer citizenship behavior (CCB). It examines the proposed relationships against boundary conditions, product categories and gender.
Design/methodology/approach
The research is descriptive, quantitative and cross-sectional investigation. It was conducted using data collected from 401 Indian omnichannel shoppers using a validated self-administered questionnaire. The proposed conceptual model was tested using Partial Least Squares-Structural Equation Modeling (PLS-SEM) and Partial Least Squares-Multi-group analysis (PLS-MGA).
Findings
The results indicate that pickup service quality in BOPIS positively impacts all the dimensions of relationship quality of the BOPIS users. Satisfaction and commitment directly affect CCB. However, trust impacts CCB indirectly through commitment. The moderating effect of the product category purchased and gender on specified relationships was tested. Results revealed the impact of pickup service quality on BOPIS users' trust and commitment differed across product categories. More impact was seen among users who purchased shopping and specialty goods. The study also found that trust-driven citizenship behavior was seen more among female BOPIS users when compared to males.
Research limitations/implications
The study is carried out on the Indian population, where omnichannel retailing is still nascent.
Originality/value
This study addresses the gap to investigate the value co-creation behavior (CCB) in the omnichannel retail context among BOPIS users. This study is the first to show that in-store pickup service quality in BOPIS might affect customer citizenship behavior through relationship quality dimensions, assessed against boundary conditions such as the product category and BOPIS user gender.
Details
Keywords
J.H. de Wet and J.H. Hall
It is generally believed that in order to maximise value for shareholders, companies should strive towards maximising MVA (and not necessarily their total market value). The best…
Abstract
It is generally believed that in order to maximise value for shareholders, companies should strive towards maximising MVA (and not necessarily their total market value). The best way to do so is to maximise the EVA, which reflects an organisation’s ability to earn returns above the cost of capital. The leverage available to companies that incur fixed costs and use borrowed capital with a fixed interest charge has been known and quantified by financial managers for some time. The popularisation of EVA and MVA has opened up new possibilities for investigating the leverage effect of fixed costs (operational leverage) and interest (financial leverage) in conjunction with EVA and MVA, and for determining what effect changes in sales would have through leverage, not only on profits, but also on EVA and MVA. Combining a variable costing approach with leverage analysis and value analysis opens up new opportunities to investigate the effect of certain decisions on the MVA and the share price of a company. A spreadsheet model is used to illustrate how financial managers can use the leverage effects of fixed costs and the (fixed) cost of capital to maximise profits and also to determine what impact changes in any variable like sales or costs will have on the wealth of shareholders.
Details