Increase in the population demands healthy food, clean air, fresh water and high secured life. To fulfil the above demands, spectrometers such as ultraviolet, Fourier transformation infrared, Raman, ...HPLC, gas chromatography are used as confirmation tool for identification of materials. The cost and space of above-mentioned instruments are more and to build low-cost spectrometer with high efficiency is a challenging research area for material scientists and engineers. In the present work, an attempt has been made to manufacture a low-cost spectrometer. The spectrometer has been designed using cardboard, DVD, a webcam and free available spectrum software named as theremino. The DVD is used as a diffraction grating and webcam as an image sensor with an overall cost of Rs 1000. This can be used as an instrument for practical demonstration for students and other research purposes for detecting pesticides level in fruits and vegetables, sensing water purity level, edible oils, etc. The spectral range can be improved by removing infrared filter integrated in webcam. The performance of the constructed spectrometer could be upgrade using effective filters and high intense low-cost lasers. This designed spectrometer will be a boon towards application in healthcare, biomedicals and food processing applications.
•Simple and cost effective electrophoretic method to fabricate plasmonic substrates.•SERS performance at three different excitation laser lines.•Promising applicability in SERS based biosensing.
In ...this work we present a simple, rapid and cost effective method to fabricate highly active SERS substrates. This method consists in an electrophoretic deposition of gold nanoparticles on a metallic nanostructured template of a commercial digital versatile disk (DVD). The negatively charged gold nanoparticles self-assemble on the positively charged DVD metallic film connected to a positive terminal of a battery, due to the influence of the electric field. When gold nanoparticles self-assembled on DVD metallic film, a 10-fold additional enhancement of Raman signal was observed when compared with the case of GNPs self-assembled on a polycarbonate DVD substrate only. Finite-difference time-domain simulations demonstrated that the additional electromagnetic field arising in the hot-spots created between gold nanoparticles and DVD metallic film induces an additional enhancement of the Raman signal. SERS efficiency of the fabricated plasmonic substrate was successfully demonstrated through detection of para-aminothiophenol molecule with three different excitation laser lines (532, 633 and 785nm). The enhancement factor was calculated to be 106 and indicates that plasmonic substrates fabricated through this method could be a promising platform for future SERS based sensors.
The accurate and precise transport of the small amounts of the liquid by the syringe pump is widely used in many fields. In this paper, an Arduino-based syringe pump is fabricated using the computer ...DVD (digital versatile disc) drive. For the fabrication of the syringe pump, low-cost electronic components such as an Arduino microcontroller, a stepper motor, a stepper motor driver, and a display are used. The tray-loading mechanism of the computer DVD drive (close/open mechanism of the tray for inserting/removing DVD) was used for the injection process. To provide the necessary force for the precise and accurate movement of the plunger of the syringe, we replaced the DC motor of the computer DVD drive with the stepper motor and the stepper motor driver. An Arduino code was developed to control the infusion process. Depending on the syringe dimension (inner diameter and barrel length), the stepper motor (angular resolution), and the motor driver (microstepping mode), the code can be modified by using the Arduino software. The syringe pump infuses the water in the flow rates from 0.005 (mL/min) to 1 (mL/min) with a maximum of 10 μL difference between the mean measured volume and the infused volume. The fabricated syringe pump does not require the complex mechanical components that are used in conventional syringe pumps. The project provides instructions for building and testing a syringe pump and enables the students to fabricate a low-cost, open-source syringe pump using the recycled parts of the computer DVD drive for less than $30. As a result, the students will increase their hardware and software skills by completing the project.
Purpose
Given the high uncertainty in the quality perception of experiential products, manufacturers use signals to influence consumers’ decisions. In the movie industry, literature shows that ...performance of the main channel (e.g. cinema) strongly influences the performance of auxiliary channels (e.g. DVDs). The success of a movie in the home country is also to be resonated by its good performance in host countries. However, the cultural contingency of these success-breeds-success (SBS) effects has not been examined. This paper aims to test the influence of cultural values on the SBS effects across channels and countries.
Design/methodology/approach
Borrowing concepts from the signaling literature and analyzing DVD sales data from six international markets using a multilevel mixed-effects model, the study finds that culture plays a significant role to influence both SBS effects.
Findings
In countries with low power distance, short-term orientation and high indulgence, consumers who purchase from auxiliary channels are more likely to be influenced by the box office performance of movies. Meanwhile, cultural distance between the home and host nations significantly decreases the cross-national SBS effect.
Research limitations/implications
The findings are likely to be generalized to online auxiliary channels of movies, but empirical testing is required to ensure that no major adaptation is required in the process. Future research can also extend the framework of this paper to include more countries into the analysis and investigate cultural variables beyond Hofstede’s dimensions.
Practical implications
This paper suggests that the SBS effects may vary across nations. When managers plan for the sequential distributions of experiential products, the cultural values of target markets should be considered to decrease the uncertainty in sales prediction.
Originality/value
This paper contributes to the existing literature by investigating the international auxiliary channels of movies and incorporating cultural values into the framework of sequential distributions. To the best of the authors’ knowledge, this study is the first to test the links between the main and auxiliary channels from an international marketing perspective.
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