Interface induced perpendicular magnetic anisotropy in Co/CoO/Co thin film structure: An in-situ MOKE investigation

Co /CoO/Co polycrystalline film was grown on Si (001) substrate and magnetic properties have been investigated using in-situ magneto-optic Kerr effect during growth of the sample. Magnetic anisotropy with easy axis perpendicular to the film surface has been observed in top Co layer, whereas bottom layer was found to be soft with in-plane magnetization without any influence of top layer. Ex-situ in-plane and out-of-plane diffraction measurements revealed that the growth of Co on oxidized interface takes place with preferential orientation of c-axis perpendicular to the film plane, which results in the observed perpendicular magnetic anisotropy. Texturing of the c-axis is expected to be a result of minimization of the interface energy due to hybridization between Co and oxygen at the interface.Comment: 9 pages, 3 figures, under review in IOP journa

A Technical Review of Efficient and High Speed Adders for Vedic Multipliers

In the VLSI system design, the main regions of research are the reduced size & increase speed path logic systems. A fundamental requirement of high speed, addition and multiplication is always needed for the high performance digital processors. In the digital system, the speed of addition depend on the propagation of carry, which is generated successively, after the previous bit has been summed & carry is propagated, into the next location. There are numerous types of adders available likes Ripple Carry Adder, Carry Look Ahead Adder, Carry Save Adder, Carry Avoid Adder, and Carry Select Adder, which have their own benefits and drawbacks. With the advances technology, proposal of Carry select adder (CSA) which deals either of the high speed, low power consumption, regularity of layout a smaller amount area and compact VLSI design implementation. Researchers justify that Ripple Carry Adder had a lesser area but having lesser in speed, in comparing with Carry Select Adders are fastest speed but possess a larger area. The Carry Look Ahead Adder is in between the spectrum having proper trade-offs between time and area complexities

Understanding Residential Occupant Cooling Behaviour through Electricity Consumption in Warm-Humid Climate

According to the India Energy Security Scenario 2047, the number of residential air conditioner (A/C) units may increase seven-fold by 2037 as compared to 2017. Also, the related energy consumption might increase four times in the next two decades, according to India’s National Cooling Action Plan. Therefore, the study of occupant cooling behaviour is essential to reduce and manage the significant electricity demand, helping to formulate and implement climate-specific cooling policies, and to adopt low-energy and low-cost technologies at mass-market scale. The study aims to analyse residential electricity consumption in order to investigate occupant behaviour, especially for thermal comfort by using space cooling and mechanical ventilation technologies. Among the five climate zones in India, this study focuses on the occupant behaviour in a warm-humid climate using Auroville as a case study, where climate analysis of the past 30 years demonstrated progression towards unprecedented warmer weather in the last five years. In this study, electricity consumption data from 18 households (flats) were monitored for seven months (November 2018–June 2019). The study also elaborated the limitations faced while monitoring and proposed a data filling methodology to create a complete daily profile for analysing occupant behaviour through electricity consumption. The results of the data-driven approach demonstrated the characteristics and complexities in occupant behaviour and insight on the operation of different technologies to attain thermal comfort in residential buildings in an increasingly warming climate

Applying dissipative dynamical systems to pseudorandom number generation: Equidistribution property and statistical independence of bits at distances up to logarithm of mesh size

The behavior of a family of dissipative dynamical systems representing transformations of two-dimensional torus is studied on a discrete lattice and compared with that of conservative hyperbolic automorphisms of the torus. Applying dissipative dynamical systems to generation of pseudorandom numbers is shown to be advantageous and equidistribution of probabilities for the sequences of bits can be achieved. A new algorithm for generating uniform pseudorandom numbers is proposed. The theory of the generator, which includes proofs of periodic properties and of statistical independence of bits at distances up to logarithm of mesh size, is presented. Extensive statistical testing using available test packages demonstrates excellent results, while the speed of the generator is comparable to other modern generators.Comment: 6 pages, 3 figures, 3 table

Response of fodder cropping sequences to irrigation scheduling in arid environment

A field experiment was conducted at Jodhpur during kharif, rabi and summer seasons for three consecutive years (2008-09, 2009-10 and 2010-11) to assess the fodder production potential, water use, water use efficiency and fodder quality of different cropping systems under variable moisture regimes. The main plot treatments consist of four cropping sequences, i.e. bajra–lucerne, cowpea– oat – bajra, Cenchrus ciliaris - C. ciliaris + lucerne, bajra + cowpea (1:1) – oat–sorghum and three irrigation levels, i.e. 50, 75 and 100 mm CPE in subplots with three replications. Among the crop sequences round the year, maximum mean green fodder yield was recorded from cowpea-oat-bajra sequence, which was at par with bajra + cowpea – oat – sorghum sequence but significantly higher than C. ciliaris +lucerne and bajra–lucerne sequences. Similarly, dry matter yield was also maximum from cowpea– oat –bajra sequence which was also at par with C.ciliaris–C. ciliaris+lucerne and bajra + cowpea – oat – sorghum sequences but was only significantly higher than bajra – lucerne sequence. During rabi season all crops produced significantly higher green fodder yield at 50 mm CPE level than 75 and 100 mm CPE levels but dry matter yield was at par at 50 and 75 mm CPE levels. Green and dry matter yields of summer crops were significantly higher at 50 mm CPE level than that of 75 and 100 mm CPE. This showed that irrigation at 75 CPE level optimized dry fodder yield during rabi season and 50 mm CPE during summer season. The fodder yield of C. ciliaris + lucerne system at 50 mm CPE and 75 mm CPE was at par but significantly higher than that of 100 mm CPE while fodder yield of bajra + cowpea (1:1)-oat–sorghum and cowpea –oat–bajra at 50 mm CPE was significantly higher than that of 75 mm CPE. Water use efficiency (WUE) and water productivity were higher with bajra, C. ciliaris and oat grown with sprinkler irrigation. Among cropping sequences • ciliaris -C. ciliaris+ lucerne system had maximum WUE and water productivity but statistically at par with cowpea- oat –bajra sequence. Water use was higher at 50 mm CPE irrigation level but water use efficiency and water productivity were higher with 75 and 100 mm CPE level. Protein yield was maximum with bajra – lucerne system followed by cowpea –oat– bajra while C. ciliaris-C. ciliaris + lucerne system had lowest protein yield being at par with bajra + cowpea–oat–sorghum sequence. Protein yield was higher with 50 mm CPE level as compared to 75 and 100 mm CPE in all cropping sequences. Irrigation at 75 mm CPE was best for C. ciliaris + lucerne intercropping system and 50 mm CPE for bajra + cowpea, oat – bajra, cowpea–oat–sorghum and bajra-lucerne crop sequence for getting higher productivity of quality fodder under arid conditions