Informatics Publishing Limited

Subhasish Das ¹, Ranajit Midya ¹, Buddhadeb Chatterjee ¹, Ranadeep Ghosh ¹, Rajib Das ¹, Asis Mazumdar ¹

Affiliations
1 School of Water Resources Engineering, Jadavpur University, Kolkata–700032, West Bengal, IN

Abstract

The three-dimensional flow field at a flat plate (side facing the approaching flow) under clear water equilibrium scour regime was experimentally measured using an acoustic Doppler Velocimeter (ADV) in a laboratory tilting flume. Reynolds stresses at different azimuthal planes are computed. The bed shear stresses are determined from the Reynolds stresses and velocity gradients at different azimuthal planes (0°, i.e., at the upstream axis of symmetry, 45° and 90°). The critical bed shear stresses on the sloping beds are also computed with the help of Shields' diagram. The findings of the present study were also compared with the results obtained by previous researchers.

Keywords

Turbulent Flow, Threshold Condition, Clear Water Scour, Reynolds’ Stress.

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Pijush Kanti Biswas ¹, Rajib Das ², Samuel Sangtam ¹

Affiliations
1 Krishi Vigyan Kendra, Mokokchung (Nagaland), IN
2 Nagaland University, Medziphema (Nagaland), IN

Abstract

The present study was conducted in Mokokchung district of Nagaland. Purposively eight villages were selected from four selected rural development (RD) blocks. From those eight villages 200 respondents were selected randomly. The study reveals that the major constrains of high quality protein maize production was noted in non-availability of quality seed by 89.50 per cent of the respondents which comes under infrastructural constraint.

Keywords

Constraints, High Quality Maize, Villages, Production.

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Rajib Das ¹, K. K. Jha ¹

Affiliations
1 Department of Agricultural Extension, Nagaland University, SASRD, Medziphema Campus (Nagaland), IN

Abstract

Potato (Solanum tuberosum L.) is the fourth most important food crop and the primary non-grain food commodity in the world. At present China is the biggest potato producer globally. Total potato produced from China and India accounts for one third production of the rest of world. India accounted for 45.57 million MT of potato from an area of 20.63 lakh ha in the year 2015-16 with an average productivity of 22.10 t/ha. The potato grows quickly and contains more energy and protein per unit area when compared to a cereal crop. Therefore, it plays a vital role in ensuring food security, which is a major concern for the country. In North Eastern region of India, the state of Assam leads in area and the state of Tripura leads in productivity of potato. Tripura having an area of 5.4 thousand hectare under potato cultivation has an average productivity of 17.80 tonnes/ha which is below the average national productivity of 22.10 tonnes/ha (NHRDF, 2016). A study was conducted in Sepahijala district of Tripura by randomly selecting two of its rural development blocks. The main objective of the study was to analyse the socio - economic and personal characteristics of the potato growers and assess their perceived training needs in context of improved potato cultivation and increase the productivity of the crop. Data analysis was done using SAS software. The findings revealed that majority of the farmers had training needs in the area of disease management followed by insect pest management and balanced use of manures and fertilizers. Correlation analysis revealed that variables age, education and knowledge had highly significant association with the variable “training needs” of the potato farmers. Variables age and knowledge were found important to explain training needs of the potato growers.

Keywords

Training Needs, Potato Growers, Correlates.

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Pijush Kanti Biswas ¹, Rajib Das ²

Affiliations
1 Krishi Vigyan Kendra, Mokokchung (Nagaland), IN
2 School of Agricultural Sciences and Rural Development, Nagaland University, Medziphema, (Nagaland), IN

Abstract

The present study was conducted in three randomly selected villages under Mokokchung district of Nagaland. From the study, it has perceived that mostly Hampshire, Local, Large black, Burmese breeds were reared by the respondents. Awareness about dry season feed management was found to be very low. Though, respondents were aware of the care and management of sow, they had lack of knowledge about care and management of boar. Regarding the care of pregnant animals, only few per cent were aware of the practices. Lastly, health control measures were followed by the half among the respondents.

Keywords

Livestock, Pig, Management, Respondents.

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Pijush Kanti Biswas ¹, Kerimenla ², Rajib Das ³

Affiliations
1 Krishi Vigyan Kendra, Mokokchung (Nagaland), IN
2 Krishi Vigyan Kendra, Mon (Nagaland), IN
3 Nagaland University, Medziphema (Nagaland), IN

Abstract

The ex-post facto study was conducted in Mokokchung district of Nagaland to know the problem faced by the Naga King Chilli growers in Mokokchung district of Nagaland”. Further 140 farmers were selected from different villages in two different blocks under Mokokchung. Results revealed from the study that lack of proper post harvest storage of Naga King chilli (90.00 %) was found the most problematic area faced by majority of the Naga King chilli growers.

Keywords

Naga King Chilli, Problems, Post Harvest Storage.

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Bipul Syam Purkayastha ¹, Rajib Das ¹

Affiliations
1 Department of Computer Science, Assam University, Silchar-788011, IN

Abstract

In the mobile ad hoc networks the major role is played by the routing protocols in order to route the data from one mobile node to another mobile node. But in such mobile networks, routing protocols are vulnerable to various kinds of security attacks such as blackhole node attacks. The routing protocols of MANET are unprotected and hence resulted into the network with the malicious mobile nodes in the network. These malicious nodes in the network are basically acts as attacks in the network. In this paper, we modify the existing DSR protocol with the functionality of attacks detection without affecting overall performance of the network. Also, we are considering the various attacks on mobile ad hoc network called blackhole attack, flooding attack and show the comparative analysis of these attacks using network simulator ns-2.

Keywords

MANET, Blackhole, Flooding, DSR, NS-2.

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Rajib Das ¹, Bijoy Mandal ¹, Santanu Das ¹

Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, IN

Abstract

Burrs are formed during various machining processes. These burrs result in difficulty in assembling operations. Being sharp, burrs may injure operators, cause electric short circuit problem, poor aesthetics of component, etc. So, deburring is commonly required to remove burrs. In the present work, drilling burrs formed on low alloy steel workpieces are tried to be removed by electro discharge machining. Electrolytic copper of 16.88 mm diameter is used as EDM tool which is made cathode and workpiece as anode. Parameters varied are peak current and pulse-on time whereas parameters such as duty factor, sparking time, lifting time, sensitivity, anti arcing, sparking gap voltage are kept constant. Peak currents are varied in the range of 4A-10A, and 50 ps, 100 ps, and 200 ps pulse-on time are taken. Initially sparking is found to be concentrated in a small area since only the burrs are attacked by the tool. When sparking spreads to the whole periphery of the tool, it indicates complete burr removal. The time taken for complete burr removal and surface roughness of specimen after deburring operation is measured. Some thickness loss of specimen has also been observed. Deburring time is found to be reduced with increase in peak current and pulseon time. At smaller values of peak current and pulse-on time, surface roughness and thickness loss are lower, but deburring time increases due to low energy of spark, which results in less heat generation and lesser melting and evaporation of burrs. Small depth of crater formed at low peak current and pulse-on time may be responsible for lower surface roughness. Parameters are optimized in order to obtain minimum deburring time, thickness loss and surface roughness.

Keywords

EDM, Burr, Deburring, Deburring Time, Surface Roughness, Thickness Loss, RSM.

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Satabdi Saha ¹, Debasri Roy ¹, Rajib Das ¹

Affiliations
1 School of Water Resources Engineering, Jadavpur University, IN

Abstract

The study narrates a work on simulation of operation of DVC system (on Damodar river of east India) (Fig. 1) for controlling flood and fulfillment of conservation goals using reservoir operation simulation model HEC-5. The model HEC-5 is used to assess flood control measures, requirements of conservation storage of reservoirs in a reservoir system and determination of operational framework for reservoir system.

Keywords

HEC-5 Model, Reservoir Operation, Performance Analysis, Guide Curve, Storage Reallocation.

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Dipankar Dey ¹, Dipak Nath ¹, Lord Litan Debbarma ¹, Subhra Shil ¹, Suresh Chandra Biswas ¹, Ardhendu Chakraborty ¹, Rajib Das ¹, Nurul Islam ¹, Subrata Choudhury ¹, Prasanto Reang ¹

Affiliations
1 Krishi Vigyan Kendra, Khowai (Tripura), IN

Abstract

North Pulinpur with GPS location 23°52.836¹ N, 91°35.275¹ E and elevation 47m is one of the draught prone tribal inhabited ADC village of the district Khowai under the state Tripura. The total geographical area of the village is 950 hectare with cultivable area of about 250 hectare only among 806 farm families. So, most of the families are holding either small or marginal farms. There was no perennial streams, rivers, ponds and other irrigation facilities in the village. Prevailing temperature ranges from 16°C to 37°C. Annual rainfall ranges from 2050 to 2550 mm, but almost whole amount goes out to neighboring lower elevated village. Agriculture is the mainstay of the people, about 85 per cent of them engage in agriculture and its allied activities. Farmers earned their livelihood from rainfed rice based monocropped cultivation. Moisture stress during Kharifdry spell and winter season which lead to rice based mono-cropping system. Under the National Innovations in Climate Resilient Agriculture(NICRA) Project KVK,Khowai has constructed and rejuvenated 22 water bodies from 2011-12 to 2018-19 at North Pulinpur ADC village; all of which provided life saving irrigation for paddy during Kharifdry spell as well as during Rabiseason through nano pumps installed nearby farm ponds. Before implementation of NICRA project to North Pulinpur ADC village, most of the areas remain dry during Rabi season. After the intervention, approximately 26187 ft 3 rainwater had been harvested covering an area of about 135.0 ha. for winter vegetables and Rabi maize cultivation and during dry period. In addition to this, a total area of about 1 ha waste land had been converted to paddy land using water from community bund. Ponds were also used for composite fish culture with average yield of 30 q/ farmer/year/ha during 2018-19.

Keywords

NICRA, KVK Khowai, Paddy.

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Prabir Kumar Maity ¹, Subhasish Das ¹, Rajib Das ¹

Affiliations
1 School of Water Resources Engineering, Jadavpur University, Kolkata 700032, West Bengal, IN

Abstract

There is a severe warning of groundwater pollution in the coastal district of Purba Medinipur, West Bengal. This is due to ingression of saline water intrusion. A top stratum of the soil in coastal area of the district is found to be made of different layer of clay and sand of sea origin. The groundwater cannot be used for domestic, irrigation or industrial purposes. As a result of continuous extraction of water, the groundwater is formed like a cone of depression. It has resulted in redundant well and therefore the water extraction has become uneconomical due to augmented lift. All these necessitate for urgent measures to control the ingression of salt water into the coastal aquifers. Some measures to control the encroachment of salt water are suggested in this paper.

Keywords

Inshore Geological Stratum, Chemical Analysis, Salt Water Ingression, Controlling Methods, Aquifer Improvement Plan.

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