Duguta Suresh Kumar, Nikhil Suri and P.K. Khanna
The purpose of this work is to explore the forms of intermetallic phase compounds (IMPCs) in Pt/In/Au and Pt/In/Ag joints by using isothermal solidification. This lead-free…
Abstract
Purpose
The purpose of this work is to explore the forms of intermetallic phase compounds (IMPCs) in Pt/In/Au and Pt/In/Ag joints by using isothermal solidification. This lead-free technique leads to formation of IMPCs having high-temperature stable joints for platinum-based micro-heater gas sensor fabricated on low temperature co-fired ceramic (LTCC) substrate.
Design/methodology/approach
Proposed task is to make an interconnection for Pt micro-heater electrode pad to the silver and gold thick-films printed on LTCC substrate. Both Pt/In/Au and Pt/In/Ag configured joints with different interactive areas prepared at 190 and 220°C to study temperature and contact surface area effects on ultimate tensile strength of the joints, for a 20 s reaction time, at 0.2 MPa applied pressure. Those delaminated joint interfaces studied under SEM, EDAX and XRD.
Findings
IMPCs identified through material analysis using diffraction analysis of XRD data are InPt3, AgIn2, AgPt, AgPt3, Au9In4 and other stoichiometric compounds. The interactive surface area between thick-films and temperature increment shows improvement in the formations of IMPCs and mechanical stability of joints. These IMPCs-based joints have improved the mechanical stability to the joints to sustain even at high operating temperatures. Elemental mapping of the weak joint contact interface shows unwanted oxide formations also reported. Physical inter-locking followed by the diffusion phenomenon on the silver substrate strengthen the interconnection has been noticed.
Research limitations/implications
Inert gas environment creation inside the chamber to isolate the lead-free joint placed between heating stamp pads to avoid oxide formations at the interface while cooling which adds up to the cost of manufacturing. Most of the oxides at a joint-interface increase minute to moderate resistance with respect to the level of oxides took place. These oxides contributed heat certainly damage the micro-heater based gas sensors while functioning.
Practical implications
These isothermal solidification-based lead-free solder joints formation replace the existing lead-based packaging techniques. These lead-free interconnections on ceramic or LTCC substrate are reliable and durable, especially those designed to work for heavy-duty engines, even at severe environment conditions.
Originality/value
Platinum micro-heater-based gas sensors handles over a wide-range of temperatures about 300 to 500°C. The specific temperature level of different oxide films (SnO2) on the micro-heater is capable of detecting various specific gases. This feature of platinum based gas sensor demands durable and mechanically stable joints for continuous monitoring.
Details
Keywords
Parvathy S. Nair, Atul Shiva, Nikhil Yadav and Priyanka Tandon
The purpose of this study is to investigate the influence of mobile applications on investment decisions by retail investors in stocks and mutual funds. This study focuses on how…
Abstract
Purpose
The purpose of this study is to investigate the influence of mobile applications on investment decisions by retail investors in stocks and mutual funds. This study focuses on how mobile technologies are applied on mobile apps by retail investors for e-trading in emerging financial markets.
Design/methodology/approach
The study explored predictive relevance for the adoption behavior of retail investors under the Unified Theory of Acceptance and Use of Technology (UTAUT) framework. Further, goal contagion theory was applied to investigate the adoption behavior of investors towards e-trading. An adapted questionnaire was used to collect the date from April to June 2021 and data analysis was performed on 507 usable responses. The methodology adopted in this study is variance based partial least square structural equational modelling (PLS-SEM). Additionally, the study explains important and performing constructs based on the response of retail investors towards mobile app usage for investment decisions.
Findings
The study shows that effort expectancy, performance expectancy followed by perceived return were the primary determinants of behavioral intentions to use mobile applications by retail investors for e-trading. Further, habit of investors determined the adoption behavior of investors towards mobile apps. Additionally, the study revealed that perceived risk is not an important aspect for retail investors in comparison to perceived return.
Research limitations/implications
The study in future can address to the aspect of personality traits of retail investors for technology adoption for investment decisions. Further investigation is required on addressing unobserved heterogeneity of retail investors towards technology adoption process in emerging financial markets.
Practical implications
The study provides theoretical and practical implications for retail investors, financial advisors and technology companies to understand the behavioral pattern and mobile apps adoption behavior of retail investors in emerging financial market. The findings in the study will help broking firms to sensitize their clients for effective use of their respective mobile apps for e-trading purposes. The study will strengthen the knowledge of financial advisors to understand investment behavior of retail investors in emerging financial markets.
Originality/value
This study unfolds a novel framework of research to understand the technology adoption pattern of retail investors for e-trading by mobile applications in emerging financial markets. The present study provides significant understanding in the domain of technology adoption by retail investors under behavioral finance environment.
Details
Keywords
Sonia Bharwani and David Mathews
This study is an empirical exploration of the tech-based transformation strategies being adopted by luxury hotels in India to assuage the fear psychosis and restore guest…
Abstract
Purpose
This study is an empirical exploration of the tech-based transformation strategies being adopted by luxury hotels in India to assuage the fear psychosis and restore guest confidence in the context of the COVID-19 pandemic. It sheds light on the “new normal” and its overarching implications for hotel operations from the user experience perspective.
Design/methodology/approach
A mixed method strategy was adopted for data collection. Qualitative data was gathered from a video analysis of two webinars with high-profile panels of thought leaders about the challenges arising from the global health crisis and related post-pandemic recovery strategies. This data has been triangulated with desk research and data collected through an online survey which sought to map guest sentiments with respect to resuming the use of hospitality services and their attitude towards the proposed tech transformation initiatives in the Indian luxury hospitality industry.
Findings
The research data indicates that despite their pandemic-related trepidations, people still have a strong urge to be social and to travel. Technology can play a pivotal role in creating safe spaces for social distancing, facilitating a contactless guest interface to alleviate guest concerns for safe hygiene and rebuilding customer confidence to address the trust deficit.
Practical implications
Hospitality organisations must be discerning in the investments they make in new technology and contactless experiences because hasty investments in extensive automation may be perceived as gimmicky by guests. Intelligent and astute use of technology tools can minimise human error, optimise service efficiency and enhance guest experience through elevated levels of personalised hospitality in luxury hotels by judiciously marrying high touch with high tech.
Originality/value
This study is the one of the first empirical explorations of the tech transformation strategies adopted by luxury hotels in the Indian context in response to the COVID-19 pandemic. It explores their efforts for the continued co-creation of high value experiences based on consumer perspectives, with implications for both hospitality and tourism theory and practice.
Details
Keywords
Ramakant Rana, Qasim Murtaza and R.S. Walia
In this study, the tri-bological behaviour of the un-coated and diamond coated tungsten carbide was evaluated using the pin-on-disc test rig. The same was also tested on a lathe…
Abstract
Purpose
In this study, the tri-bological behaviour of the un-coated and diamond coated tungsten carbide was evaluated using the pin-on-disc test rig. The same was also tested on a lathe machine tool. This paper aims to compare the tri-bological behaviour of coated tungsten carbide pin with un-coated tungsten carbide pin it also correlates the wear obtained from the two machines used.
Design/methodology/approach
Experiments were performed using L8 orthogonal array and results obtained on a pin-on-disc test rig under dry sliding process were optimized through a modern optimization technique i.e. genetic algorithm (GA). The response surface methodology model (L8 orthogonal array) formed the basis for the development of the GA model, which defines the conditions of minimum wear, minimum coefficient of friction and minimum surface roughness for the sliding process of the pin-on-disc test rig.
Findings
Implementation of the heuristic approach for optimization of input parameters for the combination of tool material used for the turning process. The initial approach involves tri-bological testing considering the same combination. The set of experiments further performed, inferred that the results were similar and that the diamond coating enhances the life of the tool.
Originality/value
Successfully synthesized the diamond coating on tungsten carbide tool material. Implantation of the heuristic approach, i.e. GA to tri-bological tests to identify the optimized level of input variables. Experimentation involves the tri-bological testing whose results were confirmed through performing experiments on the lathe machine tool.