Strain induced metal-insulator transition in ultrathin films of SrRuO3_3

The ultrathin film limit has been shown to be a rich playground for unusual low dimensional physics. Taking the example of SrRuO$_3$ which is ferromagnetic and metallic at the bulk limit, one finds that it becomes antiferromagnetic and insulating at the three monolayers limit when grown on SrTiO$_3$. The origin of the insulating state is traced to strongly orbital dependent exchange splittings. A modest compressive strain of 1% of the SrTiO$_3$ substrate is then found to drive the system into a highly confined two-dimensional 100% spin polarized metallic state. This metal-insulator transition driven by a modest strain could be useful in two state device applications.Comment: Accept in Phys. Rev.

Recent developments in additive manufacturing of gears : a review

Abstract: Additive Layer Manufacturing (ALM) is an advanced technology to produce quality gears of metals and plastics. Some significant benefits such as capability to handle complex gear shapes and design, and produce near net-shaped gears; resource efficiency; and rapid product development etc. make this process a sustainable alternate to the other processes of gear manufacturing. This paper sheds light on the development of some of the important additive layer manufacturing processes such as Stereolithography, Fused Deposition Modeling, and 3D Printing to manufacture gears. The article aims to facilitate researchers and encourages them to do further research and development for improved gear quality, process productivity, and sustainability

Developments in non-conventional machining for sustainable production - a state of art review

Abstract

Trend in Infant and Young Child Feeding practices during 2005 – 2015 in India

Background: Optimal infant and young child feeding (IYCF) practices during first 2 years of life is the key to ensuring optimal growth and development of the infant. Improving IYCF practices have an important role in reducing morbidity and mortality amongst under 5 children in India. Material & Methods: The secondary data from National Family Health Survey (NFHS)-3 and NFHS- 4 was analyzed. Objective: To assess the trend in IYCF practices during 2005 – 2015 for 13 selected states of India. Results: It was found that over a decade, there has been an improvement in early initiation of breast feeding and exclusive breastfeeding for 6 months amongst infant in 11 out of 13 states. However, a reduction in the timely initiation of complementary feeding amongst children in the age group of 6-8 months has been observed in 9 out of 13 states. Conclusion: There is a need to strengthen the efforts to further improve the IYCF practices in India for reducing high rates of undernutrition in the country

PAPR Reduction with Amplitude Clipping & Filtering, SLM & PTS Techniques for MIMO-OFDM System: A Brief Review

Nowadays MIMO-OFDM has become a popular technique for 4G wireless communications. OFDM technique combined with multiple antennas at transmitter and receiver point to high data rate, low complexity and diversity. One of the major drawbacks in the MIMO-OFDM is high peak-to-average power ratio (PAPR).Clipping & Filtering, Selective Mapping (SLM), Partial Transmit Sequence (PTS) are some of the techniques which minimizes the PAPR. In this review paper, different techniques of PAPR reduction have been studied

EXAMINING THE IMPACT OF STRUCTURAL BREAKS ON PRICE DISCOVERY EFFICIENCY: EVIDENCE FROM THE INDIAN EQUITY FUTURES MARKET

The current study aims to examine the impact of structural breaks on price discovery efficiency of Indian equity futures market. Global financial crisis, change of Government, demonetization and COVID-19 are identified as significant events. Data is divided into sub-samples of pre and post event period to study the impact of these events on price discovery efficiency of the Indian equity futures market. Unit root test is used to check stationarity of data. Granger causality test, Johansen’s cointegration test and Vector error correction methodology (VECM) are used for analysis. During full sample period, it is observed that there is a significant bi-directional causality between cash and futures markets and cash market leads futures market in price discovery. In addition, global financial crisis triggered volatility in Indian equity futures market, which reduced its price discovery efficiency, whereas, after change in Government, bidirectional transmission of information restored between cash market and futures market. Furthermore, futures market played a leading role in absorbing volatility triggered by demonetization. COVID-19 did not significantly affect price discovery efficiency of Indian equity futures market

Minimum quantity lubrication (MQL) assisted machining of grade-4 titanium

Abstract: This paper presents the results of an experimental investigation for turning of Grade-4 titanium with carbide cutting tool inserts with minimum quantity lubrication (MQL). Experiments were designed based on Taguchi’s L9 orthogonal array. The MQL parameters of flow rate (50-70-90 mL/hr); nozzle distance (20-30-40 mm) and air pressure (4-5-6 bar) were varied for three different levels each. Cutting speed, feed and depth of cut were fixed at 125 m/min; 0.2 mm/rev and 1 mm respectively. The grey relational method in conjunction with the Taguchi technique was used for optimizing the MQL parameters. The nozzle distance was recognized as the most significant parameter. The data further indicated that the optimum MQL parameters were a flow rate of 70 mL/hr, nozzle distance of 30 mm and air pressure of 6 bar. When compared to dry and wet cutting conditions MQL was shown to have significant advantages

Machinability analysis and hybrid optimization during wet turning of SS304 using coated tools

Abstract : In this work, SS304 has been machined using tungsten carbide tool inserts coated with multilayer of TiN/TiAlN under conventional wet cooling condition. Experiments have been conducted based on Taguchi robust technique with L9 orthogonal array. Effect of three important machining parameters cutting speed (CS), feed (F), and depth of cut (DC) on machinability aspects i.e. surface roughness (Ra) and material removal rate (MRR) have been investigated. Further, grey relational technique integrated with genetic algorithm (GA) was used for simultaneous optimization of MRR and Ra. It was observed that the optimized machining parameter setting for MRR and Ra is CS: 170 m/min; F: 0.2 mm/rev; and DC: 0.5 mm. The optimum values of MRR and Ra are 81.39 g/min and 3.14µm respectively