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Article
Publication date: 8 October 2018

Sajan Kapil, Prathamesh Joshi, Pravin Milind Kulkarni, Seema Negi, Ranjeet Kumar and K.P. Karunakaran

The support structures of sacrificial material are built in deposition-based additive manufacturing (AM), which are later removed either by breaking or dissolving. Such a…

Abstract

Purpose

The support structures of sacrificial material are built in deposition-based additive manufacturing (AM), which are later removed either by breaking or dissolving. Such a sacrificial material is not feasible in metal AM. The purpose of this study is to find a suitable method for eliminating the need of support mechanism. In this work, the authors use the tilting of the substrate to alleviate the need for the support mechanism altogether.

Design/methodology/approach

As in the traditional AM, the object is grown in horizontal layers. However, wherever undercuts are encountered, the substrate is tilted appropriately to capture the droplets. Such a tilt involves two rotary axes invariably. To conform to the slice geometry, these two tilts are accompanied by the three linear movements. Thus, the object with undercuts is grown in planar layers using five-axis deposition without any support structure. Each pair of the corresponding top and bottom contours of any slice defines a ruled surface. The axis of the deposition head will be aligned with the rules of this surface.

Findings

The need for the support mechanism was eliminated using five-axis deposition. This was experimentally demonstrated by building an aluminum impeller using a metal inert gas cladding head.

Research limitations/implications

In the proposed methodology, the objects with an abrupt change in the geometry are not possible to realize.

Originality/value

This manuscript proposed a novel method of eliminating the support mechanism through continuous five-axis deposition.

Details

Rapid Prototyping Journal, vol. 24 no. 7
Type: Research Article
ISSN: 1355-2546

Keywords

Article
Publication date: 10 December 2019

Seema Negi, Athul Arun Nambolan, Sajan Kapil, Prathamesh Shreekant Joshi, Manivannan R., K.P. Karunakaran and Parag Bhargava

Electron beam-based additive manufacturing (EBAM) is an emerging technology to produce metal parts layer-by-layer. The purpose of this paper is to systematically address the…

1415

Abstract

Purpose

Electron beam-based additive manufacturing (EBAM) is an emerging technology to produce metal parts layer-by-layer. The purpose of this paper is to systematically address the research and development carried out for this technology, up till now.

Design/methodology/approach

This paper identifies several aspects of research and development in EBAM.

Findings

Electron beam has several unique advantages such as high scanning speed, energy efficiency, versatility for several materials and better part integrity because of a vacuum working environment.

Originality/value

This paper provides information on different aspects of EBAM with the current status and future scope.

Details

Rapid Prototyping Journal, vol. 26 no. 3
Type: Research Article
ISSN: 1355-2546

Keywords

Abstract

Details

Journal of Intelligent Manufacturing and Special Equipment, vol. 4 no. 1
Type: Research Article
ISSN: 2633-6596

Article
Publication date: 10 February 2021

Ghanshyam Pandey and Seema Kumari

In low-income economies agriculture plays an important role in promoting economic growth and reducing poverty. Agricultural growth achieved through diversification toward the…

Abstract

Purpose

In low-income economies agriculture plays an important role in promoting economic growth and reducing poverty. Agricultural growth achieved through diversification toward the higher value crops enhance income and mitigate risk. The present study focuses on one of the eastern Indian states namely “Jharkhand”; where agriculture is the mainstay for the 80% of its rural population. The state per-capita income is below the national average; however, it has registered an impressive growth, especially in the agriculture sector in the last one decade. In this study, the authors attempt to identify the components in sources of agricultural growth; the authors also estimate the determinants of overall agricultural growth.

Design/methodology/approach

The study is based on the secondary data from 2000–2001 to 2015–2016. This paper first decomposes the agricultural growth into area, price, yields (technological improvement) and diversification effects through the method of growth accounting approach. Secondly, the study employs the new classical growth model through the ordinary least square (OLS) to examine the determinants of overall agricultural growth.

Findings

The author's findings indicate that there has been a shift in cropping patterns from the cultivation of cereals to non-cereals in the state during the study period. Among the major crops, the area under pulses cultivation has increased by 19% from 2000–t2002 to 2014–2016. The increase in area under cultivation and the diversification in favor of higher-value crops have been the major reasons for the accelerating overall agricultural growth in the state along with improvements in technology. The study reveals that increased use of fertilizer per hectare, capital formation and road density are the main determinants of high agricultural growth in the state.

Research limitations/implications

The study is based on secondary data and based on one state. A primary study to complement this could have been better. The limited data available for some of important variables related to mechanizations are also a limitation of the present study.

Originality/value

Several studies have analyzed the diversification and agricultural growth in India. With our best knowledge this kind of study has not been done so far for the state of Jharkhand in eastern India.

Details

Journal of Agribusiness in Developing and Emerging Economies, vol. 11 no. 2
Type: Research Article
ISSN: 2044-0839

Keywords

Article
Publication date: 2 August 2013

Preedip Balaji Babu and M. Krishnamurthy

The purpose of this paper is to analyse the paradigm shift of library automation to resource discovery by exploring the applications of resource discovery. The present status of…

3699

Abstract

Purpose

The purpose of this paper is to analyse the paradigm shift of library automation to resource discovery by exploring the applications of resource discovery. The present status of India on adapting resource discovery applications is discussed.

Design/methodology/approach

An evaluative method to examine the status quo of India automation and resource discovery scenario is drawn with a related literature review. Moreover, various pertinent global challenges of embracing discovery tools in the digital environment are highlighted.

Findings

The growth of the Indian library automation industry is booming. However, library software adaptation, next‐generation catalogue enhancements and community development avenues are dearth, seemingly remote and far from satisfactory.

Originality/value

The paper focuses on the emerging scenario of resource discovery applications with an overview of global challenges.

Details

The Electronic Library, vol. 31 no. 4
Type: Research Article
ISSN: 0264-0473

Keywords

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