iosr-JECE   Volume-15 ~ Issue-5 ~ Sep.-Oct. 2020

Abstract: During the most recent decade there is a quickly developing interest in Wireless Sensor Networks (WSN). With the help of this technology, attempts are being made to apply it in various areas like medical and health care, wildlife monitoring, environment monitoring, military operations etc. WSNs in general consist of sensor nodes that are capable of computing, data processing, communication to other sensor nodes. In WSN some problems arise due to energy, coverage, maintenance etc. Medium Access Control (MAC) protocol is the most affected protocol. Accessing of wireless medium and deciding the transmission of data is done by MAC layer. MAC driver and the RDC driver are the two drivers which are focused in this work. Both detecting collisions and retransmissions......

Keywords—WSN, MAC, ContikiOS, CSMA, NullMAC, ContikiMAC, CxMAC, NullRDC.

[1]. L. Lewis, "Wireless sensor networks," Smart environments: technologies, protocols, andapplications, pp. 11 46, 2004.
[2]. Mathieu Michel and Bruno Quoitin "ContikiMAC performance analysis," a technical report, April2016.
[3]. Sara Homayouni , Reza Javidan "ERA-ContikiMAC: An adaptive radio duty cycling layer inInternet of Things," in 9th International Symposium on Telecommunications 2018.
[4]. Abdulaziz Y. Barnawi, Gamel A. Mohsen, Essa Q. Shahra "Performance Analysis of RPLprotocol for Data Gathering Applications in Wireless Sensor Networks," in 10th InternationalConference on Ambient Systems, Networks and Technologies (ANT) 2019.
[5]. M. Buettner, G. V. Yee, E. Anderson, and R. Han, "X-MAC: A Short Preamble MAC Protocol forDuty-Cycled Wireless sensor networks," Proceedings of the 4th international conference on Embedded networked sensor systems, pp. 307-320, 2006..

Abstract: The scientific work deals with treatment of Barium sulphate extender pigment with iron oxide, which can be used in different architectural and industrial coatings. By depositing a thin layer of ferric oxide on barium sulphate particles a novel pigment with better optical and functional performance can be obtained when used in various coating systems. This pigment improves physicochemical performance and acts as an active barrier. The treated barium sulphate has many social and practical implications such as eco-friendly and economic than other synthetic pigments. Moreover, it is reinforcing filler in rubber, plastic and ceramic composites.

Keywords—α-Fe2O3/BaSO4 particle, pigment, surface treatment.

[1]. Gupta M & Kamani P K , Barytes: A common ore used as an extender pigment in modern surface coating, Coatings and anti corrosion enginerring review, 5(2) (2014) 70-72.
[2]. Nylen P & Sunderland E, Modern Surface Coating, (Wiley NY) 1965, 4.
[3]. Gupta M, & Kamani P K, Development of Pigment from Surface Treated Barium Sulfate Extender, China coatings Journal, (May 2011) ISSN:1682-4636, 60-67.
[4]. Gupta M & Kamani P K, Synthesis and characterization of surface treated barium sulfate extender pigment, Polymer Paint Colour Journal , 198 (4531) (2008) 32-34.
[5]. Gupta M & Kamani P K & Shukla R K, The preparation and characteristics of surface-treated barium sulfate extender pigment, Journal of Coatings Technology and Research, 10(2) (March 2013) 189-198.

Abstract: Multiplier is a key component which is majorly used in Digital electronics and Digital Signal Processing.Multiplier is a component or electronic circuit which gives product of two binary numbers. Multiplier with high speed, low power consumption and less size is preferred in the Digital Electronic field. That's why Multipliers with low power consumption and low hardware complexity got huge demand and it is always challenging to create a multiplier with these specifications. There are different Multipliers but most popular among them are Wallace Multiplier,Braun Multiplier and Dadda Multiplier.These Multipliers are differed according to their respective algorithms.Here we majorly discussed about 90 nm technology. In this paper, we discuss and review on low power multipliers with it's hardware and performance with comparisons

Keywords: Multiplier, Wallace Algorithm, Braun Multiplier, Dadda Multiplier, Low Power, Hardware Complexity, Hybrid adders, Complementary pass logic, CMOS

[1]. Inamul Hussain, Chandan Kumar Pandey and Saurabh Chaudhary: "Design and Analysis of High Performance Multiplier Circiut‟, 23-24 March 2019, NIT Silchar, Silchar, India.
[2]. G. Challa Ram, D. Sudha Rani, R. Balasaikesava, K. BalaSindhuri: "Design of delay efficient modified 16 bit Wallace multiplier", 2016 IEEE International Conference on Recent Trends in Electronics, Information & Communication Technology (RTEICT), Bangalore, 2016, pp. 1887-1891.
[3]. Sangeetha P, Aijaz Ali Khan, "Comparision of Braun Multiplier and Wallace Multiplier Techniques in VLSI," 2018 4th International Conference on Device, Circuits and Systems (ICDCS), Coimbatore, 2018, pp. 48-53.
[4]. I. Hussain and S Chaudhary, "Performance Comparision of 1-Bit Conventional and Hybrid Full Adder Circuits", In Bera R. Sarkar S. Chakraborty S. (eds) Advances in Communication, Devices and Networking Lecture Notes in Electrical Engineering, vol462 ,2018..