Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 10
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The multiply-accumulator (MAC) unit is the basic integral computational block in every digital image and digital signal processor. As the demand grows, it is essential to design these units in an efficient manner to build a successful processor. By considering this into account, a power-efficient, high-speed MAC unit is presented in this paper. The proposed MAC unit is a combination of a two-phase clocked modified sequential multiplier and a carry-save adder (CSA) followed by an accumulator register. A novel two-phase clocked modified sequential multiplier is introduced in the multiplication stage to reduce the power and computation time. For image blurring, these multiplier and adder blocks are subsequently incorporated into the MAC unit. The experimental results demonstrated that the proposed design reduced the power consumption by 52% and improved the computation time by 4% than the conventional architectures. The developed MAC unit is implemented using 180 nm standard CMOS technology using CADENCE RTL compiler, synthesized using XILINX ISE and the image blurring effect is analyzed using MATLAB.
Go to article

Authors and Affiliations

Rashmi Samanth
1
Subramanya G. Nayak
1

  1. Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576 104, India
Download PDF Download RIS Download Bibtex

Abstract

This paper deals with designing and simulation of an efficient RF-DC energy harvesting system for a remote control device. GSM down-link frequency of 935MHz to 960MHz and uplink frequency of 890MHz to 915MHz is taken as the RF source with centre frequency as 950MHz and 900MHz respectively. The simulation model has been created by using Advanced Design System (ADS) software. Performance of the circuit has been tested with matching and without matching circuits. The output voltage obtained was 0.372V DC and maximum efficiency up to 35.73% was achieved for the downlink GSM frequency by the lumped method for -10dB input source power. By considering more number of rectifier stages, output DC voltage can be increased and it can be utilized for replacing DC battery of the remote control device.
Go to article

Authors and Affiliations

Deepak Kumar Nayak
1
Arjuna Muduli
2

  1. ECE, Budge Budge Institute of Technology, Kolkata, West Bengal, India
  2. ECE, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Andhra Pradesh, India
Download PDF Download RIS Download Bibtex

Abstract

Experimental investigation of natural convection heat transfer in heated vertical tubes dissipating heat from the internal surface is presented. The test section is electrically heated and constant wall heat flux is maintained both circumferentially and axially. Four different test sections are taken having 45 mm internal diameter and 3.8 mm thickness. The length of the test sections are 450 mm, 550 mm, 700 mm and 850 mm. Ratios of length to diameter of the test sections are taken as 10, 12.22, 15.56, and 18.89. Wall heat fluxes are maintained at 250–3341 W/m2. Experiments are also conducted on channels with internal rings of rectangular section placed at various distances. Thickness of the rings are taken as 4 mm, 6 mm, and 8 mm. The step size of the rings varies from 75 mm to 283.3 mm. The nondimensional ring spacing, expressed as the ratios of step size to diameter, are taken from 1.67 to 6.29 and the non-dimensional ring thickness, expressed as the ratios of ring thickness to diameter are taken from 0.089 to 0.178. The ratios of ring spacing to its thickness are taken as 9.375 to 70.82. The effects of various parameters such as length to diameter ratio, wall heat flux, ring thickness and ring spacing on local steady-state heat transfer behavior are observed. From the experimental data a correlation is developed for average Nusselt number and modified Rayleigh number. Another correlation is also developed for modified Rayleigh number and modified Reynolds number. These correlations can predict the data accurately within ±10% error.

Go to article

Authors and Affiliations

Ramesh Chandra Nayak
Manmatha Kumar Roul
Saroj Kumar Sarangi
Download PDF Download RIS Download Bibtex

Abstract

Air pollution has a serious impact on the health of human beings and is a major cause of death worldwide every year. Out of the many sources of air pollution, the smoke generated from household combustion devices is very dangerous due to the incomplete combustion of fuel. Women from rural areas suffer a lot due to this harmful smoke. Diseases like cancer, throat, and lung infection occur in adults and children due to inhalation of this smoke. The traditional chulha used by rural women is operated by using cow dung, straw, and wood, and the air is blown manually by using small metallic pipes. This paper presents the design and development of an innovative stove to maximize flame temperature and minimize air pollution to overcome the health-related issues of rural women. A smokeless stove is presented, in which wood, straw, and cow dung are taken as primary fuel, and superheated steam as a secondary oxidizer for its operation. In this stove, a forced draft is created by the provision of a small fan, which is operated by solar power thus eliminating the need of creating a forced draft manually by the cook which makes this innovative stove superior to the traditional chulha. Owing to the provision of superheated steam, the flame temperature as well as the burning efficiency increases. The cooking time is reduced due to higher flame temperature as compared to the liquefied petroleum gas stove. The main objective of this work is to minimize air pollution and provide a smoke-free environment to the people using such devices as this innovative stove offers complete combustion of fuel. The flame temperature of the designed stove ranges from 595˚C to 700˚C and its thermal efficiency is 10–17% higher than that of the traditional chulha. The design of this stove is unique, and its maintenance cost is also much less.
Go to article

Bibliography

[1] James B.S., Shetty R.S., Kamath A., Shetty A.: Household cooking fuel use and its health effects among rural women in southern India — A cross-sectional study. PLoS ONE 15(2020), 4, e0231757.
[2] Balakrishnan K.: Examining health effects of air pollution in India. ICMR Cent. Adv. Res. Environ. Health, New Delhi 2013.
[3] Onah I., Ayuba H.K., Idris N.M.: Estimation of fuelwood-induced carbon emission from the use of improved cook stoves by selected households in Kwara State, Nigeria. Clim. Change 160 (2020), 3, 463–477.
[4] Obi O.F., Ezema J.C., Okonkwo W.I.: Energy performance of biomass cookstoves using fuel briquettes. Biofuels 11 (2020), 4, 467–478.
[5] Woldesemayate A.T., Atnaw S.M.: A review on design and performance of improved biomass cooks stoves. L. N. Inst. Comp. Sci. Soc.-Inf. Telecomm. Eng. LNICST 308(2020), 557–565.
[6] Flores W.C., Bustamante B., Pino H.N., Al-Sumaiti A., Rivera S.: A national strategy proposal for improved cooking stove adoption in Honduras: Energy consumption and cost-benefit analysis. Energies 13(2020), 4, en13040921.
[7] Mekonnen B.Y., Hassen A.A.: Design, construction and testing of hybrid solarbiomass cook stove. L. N. Inst. Comp. Sci. Soc.-Inf. Telecomm. Eng. LNICST 274 (2019), 225–238.
[8] Jain T., Sheth P.N.: Design of energy utilization test for a biomass cook stove. Formulation of an optimum air flow recipe. Energy 166(2019), 1097–1105.
[9] Manyuchi M.M., Mbohwa C., Muzenda E., Mpeta, M.: Adoption of eco cook stoves as a way of improving energy efficiency. In: Proc. Int. Conf. on Industrial Engineering and Operations Management, Pilsen, July 23–26, 2019, 35–39.
[10] Prasannakumaran K.M., Karthikeyan M., Sanjay Kumar C., Premkumar, D., Kirubakaran V.: Integration of cooking trays for waste heat recovery in the energy efficient wood stove. Indian J. Environ. Prot. 39(2019), 1, 69–73.
[11] Emetere M.E., Okonkwo O.D., Jack-Quincy S.: Investigating heat sink properties for an efficient construction of energy generating cook stove for rural settler. Int. J. Manuf. Mater. Mech. Eng. 8(2018), 3, 12–22.
[12] Tom S., Shuma M.R., Madyira D.M., Kaymakci A.: Performance testing of a multi-layer biomass briquette stove. In: Proc. Conf. Ind. Commer. Use Energy ICUE (2017), 8068008.
[13] Roul M.K., Nayak, R.C.: Experimental investigation of natural convection heat transfer through heated vertical tubes. Int. J. Eng Res Appl. 2(2012), 6, 1088–1096.
[14] Nayak R.C., Roul M.K., Sarangi S.K.: Experimental investigation of natural convection heat transfer in heated vertical tubes with discrete rings. Exp. Tech. 41(2017), 585–603.
[15] Nayak R.C., Roul M.K., Sarangi S.K.: Experimental investigation of natural convection heat transfer in heated vertical tubes. Int. J. Appl. Eng. Res. 12(2017), 2538–2550.
[16] Nayak R.C., Roul M.K., Sarangi, S.K.: Natural convection heat transfer in heated vertical tubes with internal rings. Arch. Thermodyn. 39(2018), 4, 85–111.
[17] Sahoo L.K., Roul, M.K., Swain R.K.: CFD analysis of steady laminar natural convection heat transfer from a pin finned isothermal vertical plate. Heat Transf. – Asian Res. 46(2017), 840–862.
[18] Sahoo L.K., Roul M.K., Swain R.K.: Natural convection heat transfer augmentation factor with square conductive pin fin arrays. J. Appl. Mech. Tech. Phys. 58(2017), 1115–1122.
[19] Sahoo L.K., Roul M.K., Swain R.K.: CFD analysis of natural convection heat transfer augmentation from square conductive horizontal and inclined pin fin arrays. Int. J. Ambient Energy 39(2018), 840–851.
[20] Baqir M., Bharti S.K., Kothari R., Singh, R.P.: Assessment of an energyefficient metal stove for solid biomass fuel and evaluation of its performance. Int. J. Environ. Sci. Technol. 16(2019), 11, 6773–6784.
[21] Saravanna J.Y., KantamnenR., Fasil N., Sivamani S., Hariram V., Micha Premkumar T., Mohan., T.: Modelling and analysis of water heating using recovered waste heat from hot flue gases of stove. ARPN J. Eng. Appl. Sci. 12(2017), 21, 6164–6171.
[22] Thakur M., Boudewijns E.A., Babu G.R., Winkens B., de Witte L.P., Gruiskens J., Sushama P., Ghergu C.T., van Schayck O.C.P.: Low-smoke stove in Indian slums: Study protocol for a randomised controlled trial. BMC Public Health 17(2017), 1, 454.
[23] Smith K.R., Sagar A.: Making the clean available: Escaping India’s Stove Trap. Energy Policy 75(2014), 410–414.
[24] Hanbar R.D., Karve, P.: National Programme on Improved Stove (NPIC) of the Government of India: an overview. Energy Sustain. Dev. 6(2002), 2, 49–55.
[25] Gowda M.C., Raghavan G.S.V., Ranganna B., Barrington S.: Rural waste management in a south Indian village – A case study. Bioresour. Technol. 53(1995), 2, 157–164.
[26] Wang Y., Bailis R.: The revolution from the kitchen: Social processes of the removal of traditional cookstoves in Himachal Pradesh, India. Energy Sustain. Dev. 27(2015), 127–136.
[27] Kammen D.M.: Cook stoves for the developing world. Sci. Am. 273(1995), 1, 72–75.
[28] Asi E.M.: An integrated analytical framework for analysing expansive learning in improved cook stove practice. Learn. Cult. Soc. Interact. 26(2020), 100414.
[29] Kshirsagar M.P., Kalamkar V.R.: Application of multi-response robust parameter design for performance optimization of a hybrid draft biomass cook stove. Renew. Energy 153(2020), 1127–1139.
[30] Koroll G.W., Mulpuru S.R.: The effect of dilution with steam on the burning velocity and structure of premixed hydrogen flames. Symp. (Int.) Combust. 21(1988), 1, 1811–1819.
[31] Mujumdar A.S.: Superheated steam drying. In: Handbook of Industrial Drying (3rd Edn.). CRC Press, Boca Raton 2006.
[32] Potter D.: Measuring Temperature with Thermocouples – A Tutorial. National Instruments Application Note 043, Nov. (1996).
Go to article

Authors and Affiliations

Ramesh Chandra Nayak
1
Manmatha K. Roul
2
Prateek Debadarsi Roul
3

  1. Synergy Institute of Technology, Bhubaneswar – 752101, Odisha, India
  2. GITA Autonomous College, Bhubaneswar – 752054, Odisha, India
  3. Odisha University of Technology and Research, Bhubaneswar – 751003, Odisha, India
Download PDF Download RIS Download Bibtex

Abstract

Computer-aided tools help in shortening and eradicating numerous repetitive tasks that reduces the gap between digital model and actual product. Use of these tools assists in realizing free-form objects such as custom fit products as described by a stringent interaction with the human body. Development of such a model presents a challenging situation for reverse engineering (RE) which is not analogous with the requirement for generating simple geometric models. Hence, an alternating way of producing more accurate three-dimensional models is proposed. For creating accurate 3D models, point clouds are processed through filtering, segmentation, mesh smoothing and surface generation. These processes help in converting the initial unorganized point data into a 3D digital model and simultaneously influence the quality of model. This study provides an optimum balance for the best accuracy obtainable with maximum allowable deviation to lessen computer handling and processing time. A realistic non trivial case study of free-form prosthetic socket is considered. The accuracy obtained for the developed model is acceptable for the use in medical applications and FEM analysis.

Go to article

Authors and Affiliations

Vimal Kumar Pathak
Chitresh Nayak
Amit Kumar Singh
Himanshu Chaudhary
Download PDF Download RIS Download Bibtex

Abstract

Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing. Like air pollution, noise pollution is one of the serious matters of concern in urban areas. Noise pollution occurs when noise level exceeds certain limit and has deleterious effects on human health and wellness. The major sources of noise pollution are industries, road traffic, railways, airplane traffic and social celebrations. The traffic noise is notably high in cities due to higher density of population, frequent movement of people, good transport system coupled with increasing numbers of vehicles (on road). In this work, the assessments of traffic noise in Sambalpur city is presented. Twelve important locations were chosen for the assessment. Noise contours were drawn to visualize the spreading of traffic noise into its surroundings. At the same time, the effect of noise pollution on wellness of the exposed people was studied. The study shows that the traffic noise level and its effects, are both in an alarming stage in the city.
Go to article

Authors and Affiliations

Alekh Kumar Sahu
1
Satish Kumar Nayak
2
Chitta Ranjan Mohanty
3
Prasant Kumar Pradhan
1

  1. Department of Mechanical Engineering, Veer Surendra Sai University of Technology, Burla, India
  2. Department of Civil Engineering, Veer Surendra Sai University of Technology, Burla, India
  3. Department of Civil Engineering, Parala Maharaja Engineering College, Berhampur, India
Download PDF Download RIS Download Bibtex

Abstract

Skin Cancer is one of the most widely present forms of cancer. The correct classification of skin lesions as malignant or benign is a complex process that has to be undertaken by experienced specialists. Another major issue of the class imbalance of data causes a bias in the results of classification. This article presents a novel approach to the usage of metadata of skin lesions' images to classify them. The usage of techniques addresses the problem of class imbalance to nullify the imbalances. Further, the use of a convolutional neural network (CNN) is proposed to finetune the skin lesion data classification. Ultimately, it is proven that an ensemble of statistical metadata analysis and CNN usage would result in the highest accuracy of skin color classification instead of using the two techniques separately.
Go to article

Authors and Affiliations

Sachin Nayak
1
Shweta Vincent
1
Sumathi K
2
Om Prakash Kumar
3
Sameena Pathan
4

  1. Department of Mechatronics Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
  2. Department of Mathematics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
  3. Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India
  4. Department of Information and Communication Technology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, India

This page uses 'cookies'. Learn more