ASHIKUR RAHMAN - Academia.edu (original) (raw)

Papers by ASHIKUR RAHMAN

International Journal of Industrial Management, 2020

Bangladesh observes the production of approximately 400,000 metric tonnes of e-waste every year. ... more Bangladesh observes the production of approximately 400,000 metric tonnes of e-waste every year. It is expected that it will witness a 20% increase annually. In order to implement e-waste recycling, it is essential to uncover the influencing factors. In this study, electronic shop owners act as one of the major players responsible for the aggregation of e-waste in the country. Based on Value-Belief-Norm Theory, Self Determination Theory and synthesizing relevant literature in the body of knowledge, this paper presents an integrated conceptual model consisting Altruistic values, Egoistic values, Biosphric values, Environmental belief, Personal norm, Intrinsic motivation and Extrinsic motivation, which are predicted to influence e-waste separation intention in Bangladesh. From a practical point of view, this research sheds light on key determinants that affect separation intention, in which practitioners need to consider when developing strategies concerning e-waste management and pol...

Advanced Materials Research, 2011

Electrical discharge machining (EDM) is relatively modern machining process having distinct advan... more Electrical discharge machining (EDM) is relatively modern machining process having distinct advantages over other machining processes and able to machine Ti-alloys effectively. This paper attempts to investigate the effects of peak ampere, pulse on time and pulse off time on tool wear rate (TWR) of titanium alloy Ti-6Al-4V in EDM utilizing copper tungsten as an electrode and positive polarity of the electrode. A mathematical model for electrode wear rate is developed in this paper. Design of experiments method and response surface methodology techniques are implemented. The validity test of the fit and adequacy of the proposed models has been carried out through analysis of variance. It can be seen that as the peak current increases the TWR decreases till certain ampere and then increases. The excellent surface finish is investigated in this study at short pulse on time and in contrast the long pulse duration causes the lowest TWR. Long pulse off time provides minimum TWR and the impact of pulse interval on TWR depends on peak current. The result leads to wear rate of electrode and economical industrial machining by optimizing the input parameters.

Advanced Materials Research, 2011

This paper presents the influence of EDM parameters in terms of peak ampere, pulse on time and pu... more This paper presents the influence of EDM parameters in terms of peak ampere, pulse on time and pulse off time on surface roughness of titanium alloy (Ti-6Al-4V). A mathematical model for surface finish is developed using response surface method (RSM) and optimum machining setting in favor of surface finish are evaluated. Design of experiments (DOE) techniques is implemented. Analysis of variance (ANOVA) has been performed to verify the fit and adequacy of the developed mathematical models. The acquired results yield that the increasing pulse on time causes fine surface till a certain value and then deteriorates the surface finish. It is investigated that about 200 µs pulse off time produce superior surface finish. These results lead to desirable surface roughness and economical industrial machining by optimizing the input parameters.

Waste Management & Research: The Journal for a Sustainable Circular Economy, 2020

Each year Bangladesh produces around 400,000 metric tonnes of e-waste. E-waste accumulation is ex... more Each year Bangladesh produces around 400,000 metric tonnes of e-waste. E-waste accumulation is expected to increase by 20% annually. In order to facilitate e-waste recycling, it is crucial to identify the factors. In this study, building on the stimulus-organism-response framework, we develop a research model to explore the effect of information publicity, ascription of responsibility and convenience of recycling on the recycling attitude, subjective norm, personal norm and perceived behaviour control which lead to recycling intention. Data were gathered from 127 small and medium electronics store managers. The structural equation modelling technique was used to test the paths. The result suggests a significant influence of the element of stimulus (S) on the element of organism (O). The relationship between the element of organism (O) and the element of response (R) is partial. This paper contributes to the body of work dedicated to helping us better understand the recycling behavio...

International Journal of Industrial Management, 2020

Bangladesh observes the production of approximately 400,000 metric tonnes of e-waste every year. ... more Bangladesh observes the production of approximately 400,000 metric tonnes of e-waste every year. It is expected that it will witness a 20% increase annually. In order to implement e-waste recycling, it is essential to uncover the influencing factors. In this study, electronic shop owners act as one of the major players responsible for the aggregation of e-waste in the country. Based on Value-Belief-Norm Theory, Self Determination Theory and synthesizing relevant literature in the body of knowledge, this paper presents an integrated conceptual model consisting Altruistic values, Egoistic values, Biosphric values, Environmental belief, Personal norm, Intrinsic motivation and Extrinsic motivation, which are predicted to influence e-waste separation intention in Bangladesh. From a practical point of view, this research sheds light on key determinants that affect separation intention, in which practitioners need to consider when developing strategies concerning e-waste management and pol...

Advanced Materials Research, 2011

Electrical discharge machining (EDM) is relatively modern machining process having distinct advan... more Electrical discharge machining (EDM) is relatively modern machining process having distinct advantages over other machining processes and able to machine Ti-alloys effectively. This paper attempts to investigate the effects of peak ampere, pulse on time and pulse off time on tool wear rate (TWR) of titanium alloy Ti-6Al-4V in EDM utilizing copper tungsten as an electrode and positive polarity of the electrode. A mathematical model for electrode wear rate is developed in this paper. Design of experiments method and response surface methodology techniques are implemented. The validity test of the fit and adequacy of the proposed models has been carried out through analysis of variance. It can be seen that as the peak current increases the TWR decreases till certain ampere and then increases. The excellent surface finish is investigated in this study at short pulse on time and in contrast the long pulse duration causes the lowest TWR. Long pulse off time provides minimum TWR and the impact of pulse interval on TWR depends on peak current. The result leads to wear rate of electrode and economical industrial machining by optimizing the input parameters.

Advanced Materials Research, 2011

This paper presents the influence of EDM parameters in terms of peak ampere, pulse on time and pu... more This paper presents the influence of EDM parameters in terms of peak ampere, pulse on time and pulse off time on surface roughness of titanium alloy (Ti-6Al-4V). A mathematical model for surface finish is developed using response surface method (RSM) and optimum machining setting in favor of surface finish are evaluated. Design of experiments (DOE) techniques is implemented. Analysis of variance (ANOVA) has been performed to verify the fit and adequacy of the developed mathematical models. The acquired results yield that the increasing pulse on time causes fine surface till a certain value and then deteriorates the surface finish. It is investigated that about 200 µs pulse off time produce superior surface finish. These results lead to desirable surface roughness and economical industrial machining by optimizing the input parameters.

Waste Management & Research: The Journal for a Sustainable Circular Economy, 2020

Each year Bangladesh produces around 400,000 metric tonnes of e-waste. E-waste accumulation is ex... more Each year Bangladesh produces around 400,000 metric tonnes of e-waste. E-waste accumulation is expected to increase by 20% annually. In order to facilitate e-waste recycling, it is crucial to identify the factors. In this study, building on the stimulus-organism-response framework, we develop a research model to explore the effect of information publicity, ascription of responsibility and convenience of recycling on the recycling attitude, subjective norm, personal norm and perceived behaviour control which lead to recycling intention. Data were gathered from 127 small and medium electronics store managers. The structural equation modelling technique was used to test the paths. The result suggests a significant influence of the element of stimulus (S) on the element of organism (O). The relationship between the element of organism (O) and the element of response (R) is partial. This paper contributes to the body of work dedicated to helping us better understand the recycling behavio...