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Now showing items 1 - 16 of 254

  • Prospects of Photonic Crystal Fiber as Physical Sensor: An Overview

    De, Moutusi   Gangopadhyay, Tarun Kumar   Singh, Vinod Kumar  

    Photonic crystal fiber sensors have potential application in environmental monitoring, industry, biomedicine, food preservation, and many more. These sensors work based on advanced and flexible phototonic crystal fiber (PCF) structures, controlled light propagation for the measurement of amplitude, phase, polarization and wavelength of spectrum, and PCF-incorporated interferometry techniques. In this article various PCF-based physical sensors are summarized with the advancement of time based on reported works. Some physical PCF sensors are discussed based on solid core as well as hollow core structures, dual core fibers, liquid infiltrated structures, metal coated fibers, grating incorporated fibers. With the advancement of sensing technology the possibilities of temperature, pressure, strain, twist, curvature, electromagnetic field, and refractive index sensing are discussed. Also, limitations as well as possible solutions and future hopes are outlined.
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  • Dual-Band Wearable Rectenna for Low-Power RF Energy Harvesting

    Naresh, B.   Singh, Vinod Kumar   Bhargavi, V.   Garg, Amik   Bhoi, Akash Kumar  

    In this paper, a dual-band textile rectenna is fabricated and tested to power the wireless and wearable sensor systems at 2.45 and 5.8 GHz. The wearable rectenna substrate is designed with a textile material and conductive element is a copper tap. Fabricated antenna has a size of 50 x 50 mm(2) and it is effortlessly bent on human body. The rectenna element is also fabricated on the same textile material and RF to DC conversation is investigated for power levels -20 to 15 dBm. The wearable antenna has experimentally measured impedance bandwidth of 40% for primary band and 51% for second band. The rectenna has maximum efficiency of 60% at -3 dBm (5.8 GHz) and 0 dBm (2.45 GHz).
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  • Prospects of Photonic Crystal Fiber as Physical Sensor: An Overview

    De, Moutusi   Gangopadhyay, Tarun Kumar   Singh, Vinod Kumar  

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  • Cause-related marketing and start-ups:moderating role of cause involvement

    Aggarwal, Vivek   Singh, Vinod Kumar  

    Purpose Cause-related marketing (CrM) through social campaigns is becoming one of the main strategic marketing tools for large businesses. The purpose of this study is to find out the significance of CrM for start-ups and to evaluate the moderating role of cause involvement of consumer on the impact of CrM campaigns on purchase intention of consumers. Design/methodology/approach Both structural equation modelling and hierarchical analysis were used to evaluate the responses of 1,425 male and female consumers in India towards CrM campaign. Findings The results revealed that the effect of CrM campaigns on purchase intention of consumers is significantly moderated by consumers' cause involvement. Thus, companies must extend support to causes having high consumer involvement. Research limitations/implications - Based on their findings, the authors suggest finding out the effects of CrM on the long- termsustainability of the start- ups in more detail, especially in developing countries like India. The scope of this study is one country- based; thus, research findingsmay not be generalised. Practical implications - Small businesses that are able to understand the needs of their own communities and recognise that through their efforts they can bring large impact on social issues and will see success through their socially responsible mindset. Society today needs businesses to support good causes. The best model of CrM, especially for start- ups, is the one in which while making a payment for a service or purchasing a product, the consumer is asked to make an additional payment for the social cause. Social implications - Society today needs businesses to support good causes. CrM campaigns provide consumers a chance to help the less fortunate and do so in regular and convenient ways. The study indicates the importance of both corporate citizenship and social responsibility among small businesses. Originality/value - While the current results show that the majority of studies were based on large business, this paper shows that the CrM can be useful for start- ups, medium and small businesses also. The suggested model can be an innovative way to implement CrM without incurring any additional cost. The conclusions confirm within a wider context the role of cause involvement as a moderator of the purchase intention and can further assist start- ups and small- scale companies in designing better targeted CrM campaigns benefiting the society at large.
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  • Low Power Circularly Polarized Wearable Rectenna for RF Energy Harvesting

    Naresh, B.   Singh, Vinod Kumar   Bhargavi, V.  

    In this communication, an ameliorate textile circularly polarized (CP) rectenna for harvesting the emitted RF energy in INSAT band is presented. The textile antenna is bendable, robust, and low mass so that it can be weaving into clothes of the smart soldier to charge the portable electronic devices in the battlefield. Weight burden on the soldiers is significantly reduced; indeed power handling capacity is increased by integrating the textile rectifying antenna into soldier clothes. The proposed textile rectenna has a 10-dB return-loss bandwidth of 1200 MHz (6.6-7.8 GHz) with the maximum gain 8.14 dB an overall size of 50 x 50 1.076 mm(3). This antenna is suitable for INSAT band (6.725-7.025 GHz) RF energy harvesting operations. Measurement results are also shown with theoretical predictions, both of which are in quite good agreement.
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  • A fiber optic refractive index sensor with a high index ZnO overlay

    Khanikar, Tulika   Singh, Vinod Kumar   Sheoran, Jyoti  

    An intrinsic fiber optic sensor is developed by inserting a section of no-core fiber between two multimode fibers and is applied for refractive index sensing. The sensing principle is based on modulation of evanescent waves, and hence intensity of transmitted light. The sensitivity of the sensor is found to increase by coating the sensing region with a thin layer of high index ZnO. The number of ZnO layers is also optimized and a high sensitivity of 804.57%/ RIU is obtained for nine layers of ZnO-coated sensor, with a fast response time of 5 s. Apart from high sensitivity and a fast response time, the experimental investigations also indicate that the proposed sensor produces fairly accurate, stable and repeatable results, with negligible cross sensitivity to environmental temperature.
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  • Psychological Empowerment and Employee Engagement

    Sharma, Naman   Singh, Vinod Kumar  

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  • Classical swine fever in India: current status and future perspective

    Singh, Vinod Kumar   Rajak, Kaushal Kishore   Kumar, Amit   Yadav, Sharad Kumar  

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  • Classical swine fever in India: current status and future perspective.

    Singh, Vinod Kumar   Rajak, Kaushal Kishore   Kumar, Amit   Yadav, Sharad Kumar  

    Classical swine fever (CSF) is a globally significant disease of swine caused by classical swine fever virus. The virus affects the wild boars and pigs of all age groups, leading to acute, chronic, late-onset or in-apparent course of the disease. The disease causes great economic loss to the piggery industry due to mortality, stunted growth, poor reproductive performance, and by impeding the international trade of pig and pig products. In India, CSF outbreaks are reported from most of the states wherever pig rearing is practiced and more frequently from northeast states. In spite of the highly devastating nature and frequent outbreaks, CSF remained underestimated and neglected for decades in India. The country requires rapid and sensitive diagnostic tests for an early detection of infection to limit the spread of the disease. Also, effective prophylactics are required to help in control and eradication of the disease for the development of the piggery industry. This review looks into the economic impact; epidemiology of CSF highlighting the temporal and spatial occurrence of outbreaks in the last two decades, circulation, and emergence of the virus genotypes in and around the country; and the constraints in the disease control, with the aim to update the knowledge of current status of the disease in India. The article also emphasizes the importance of the disease and the need to develop rapid specific diagnostics and effective measures to eradicate the disease.=20
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  • No-core fiber-based highly sensitive optical fiber pH sensor

    Bhardwaj, Vanita   Pathak, Akhilesh Kumar   Singh, Vinod Kumar  

    The present work describes the fabrication and characterization of an optical fiber pH sensor using a sol-gel technique. The sensing head configuration is incorporated using a short section of no-core fiber, coated with tetraethyl orthosilicate and spliced at the end of a single mode fiber with a bulge. Different types of indicators (bromophenol blue, cresol red, and chlorophenol red) were used to achieve a wide pH range from 2 to 13. High sensitivities of the fabricated device were found to be 1.02 and -0.93 nm/pH for acidic and alkaline solutions, respectively. From the characterization results, it was noted that there is an impact of ionic strength and an effect of the temperature of liquid on the response characteristic, which is an advantage of the existing device over the other pH sensors. The fabricated sensor exhibited good reflection spectrum, indicating a blueshift in resonance wavelength for alkaline solutions and a redshift for acidic solutions. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
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  • Microstrip Textile Antenna with Jeans Substrate with Applications in S-Band

    Singh, Niharika   Singh, Vinod Kumar   Saini, Rahul   Saini, J. P.   Bhoi, Akash Kumar  

    In this article, the proposed textile antenna has been studied with better results, high directivity, high gain, good return loss and multiple bands are obtained for wide range of applications in S-band with multiple bands. The substrate material of the proposed antenna is a jean which is a flexible material, the patch and partial ground plane are of copper. There is a modification in proposed textile antenna design with the same size but better return loss and multiple bands. The simulations of the proposed antenna were carried using CST Microwave Studio software.
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  • NOVEL POLYMORPHS OF AXITINIB

    The present invention relates to novel crystalline polymorphic forms of Axitinib Formula (I). Said crystalline forms may be useful in the improved preparation of oral dosage forms for the treatment of cancer.
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  • A fiber optic refractive index sensor with a high index ZnO overlay

    Khanikar, Tulika   Singh, Vinod Kumar   Sheoran, Jyoti  

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  • Cause-related marketing and start-ups: moderating role of cause involvement

    Aggarwal, Vivek   Singh, Vinod Kumar  

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  • Highly Non-linear Simple Designed Solid Core Photonic Crystal Fiber

    De, Moutusi   Gangwar, Rahul Kumar   Singh, Vinod Kumar  

    A highly non-linear solid core photonic crystal fiber (SCPCF) is designed in the present work. Three hexagonal air hole rings in cladding region and four very small air holes are present in a symmetric manner in the core region. By using full vectorial finite element method (FVFEM) with the perfectly matched layer, we study numerically the effective area of modal pattern as well as the nonlinear coefficient of this proposed SCPCF. For this proposed fiber a small modal effective area 5.58 mu m(2) and a high nonlinear coefficient 21.38 W-1 km(-1) are obtained at communication wavelength 1.55 mu m for the small air holes in the core with diameter 0.15 mu m. This type of SCPCF is useful for different nonlinear applications.
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  • A novel use of etched multi-mode fibre as magnetic field sensor

    Bhardwaj, Vanita   Singh, Vinod Kumar  

    In this study, an optical fibre magnetic field sensor is experimentally demonstrated using chemical etched multimode fibre sandwiched between two single mode fibres. The obtained result of the magnetic field and refractive index response shows that the decreasing fibre diameter in the sensing region plays an important role to enhance the sensitivity of the device. The magnetic field sensing is based on a tunable refractive index (RI) property of magnetic fluid infiltrated into the capillary tube. The sensing system is verified by testing RI of different concentrations of sodium chloride (NaCl) solution before sealing in capillary tube. Experimental results show that the sensor with taper fibre diameter of 45 mu m has relatively high magnetic field sensitivity of similar to 0.993 dB/mT ranging from 0 to 6 mT. The proposed devices find potential applications in magnetic field sensing.
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